# Gates Learjet 25D - Type: Aircraft model (FAA registry) - Registry code: 5170514 - Manufacturer (registry): GATES LEARJET - Model: 25D - Aircraft type: Fixed wing multi engine - Category: Airplane - Engines: 2 · Turbo-jet - Seats: 10 - Weight class: 12,500 to 19,999 lb - Cruise speed: 390 mph - Certification: Type certificated - Data sheet: [TCDS A10CE](https://openairdocs.org/tcds/A10CE) (OpenAirDocs) - Holder: Learjet Inc. - Registered aircraft: 20 - Page: https://openairdocs.org/model/gates-learjet-25d Model codes come from the FAA registry's reference file. ADs are matched to them by model name and maker. ## ADs that may apply (OpenAirDocs) Matched to this model by model name and maker. Each AD's applicability may narrow it by serial number, part number or equipment. - [AD 2007-04-18](https://openairdocs.org/ad/2007-04-18): Left- and right-hand standby fuel pump switches · Learjet 23, 24, 24A and 25 more. Effective Mar 23, 2007 - [AD 2005-23-06](https://openairdocs.org/ad/2005-23-06): Thrust reverser hydraulic system · Engine thrust reversers (NORDAM Group STC SA1669SW or 2 others). Effective Dec 19, 2005 - [AD 2005-23-03](https://openairdocs.org/ad/2005-23-03): Spherical accumulator for the main hydraulic system · Learjet 23, 24, 24A and 14 more. Effective Dec 19, 2005 - [AD 2005-13-36](https://openairdocs.org/ad/2005-13-36): Center ball of the aileron control cable · Learjet 23, 24, 24A and 21 more. Effective Aug 9, 2005 - [AD 2001-07-11](https://openairdocs.org/ad/2001-07-11): Main Landing Gear Tires · Learjet 23, 24, 24A and 25 more. Effective May 1, 2001 - [AD 99-16-03](https://openairdocs.org/ad/99-16-03): Horizontal Stabilizer Anti-Ice System · Learjet 23, 24, 24A and 22 more. Effective Sep 7, 1999 - [AD 95-20-03](https://openairdocs.org/ad/95-20-03): Airplane Flight Manual (AFM) - Altitude Limitations · Learjet 24, 24A, 24B and 24 more. Effective Nov 2, 1995 - [AD 92-19-12](https://openairdocs.org/ad/92-19-12): Oxygen Plumbing & Map Light Wires · Learjet 23, 24, 24A and 22 more. Effective Nov 17, 1992 - [AD 89-12-01](https://openairdocs.org/ad/89-12-01): Drag Chute Riser · Learjet 24, 24A, 24B and 22 more. Effective Jul 3, 1989 - [AD 86-05-05 R1](https://openairdocs.org/ad/86-05-05-R1): Battery Vent System · Learjet 23, 24, 24A and 20 more. Effective Jan 19, 1988 - [AD 86-22-05](https://openairdocs.org/ad/86-22-05): Flap Sector Mounting Brackets Inspection · Learjet 23, 24, 24A and 23 more. Effective Nov 10, 1986 - [AD 82-01-05 R2](https://openairdocs.org/ad/82-01-05-R2): Stall Warning Accelerometer Unit · Learjet 23, 24, 24A and 16 more. Effective Apr 10, 1986 - [AD 80-19-11 R1](https://openairdocs.org/ad/80-19-11-R1): Automatic Flight Control and Stall Warning Systems · Learjet 23, 24, 24A and 20 more. Effective May 20, 1985 - [AD 84-19-06](https://openairdocs.org/ad/84-19-06): Tab Control System · Learjet 24, 24A, 24B and 22 more. Effective Oct 22, 1984 - [AD 81-16-08 R3](https://openairdocs.org/ad/81-16-08-R3): Operation Altitudes · Learjet 24E, 24F, 25D and 1 more. Effective Feb 7, 1983 - [AD 81-13-07](https://openairdocs.org/ad/81-13-07): Change to AFM Fuel Starvation · Learjet 23, 24, 24A and 20 more. Effective Jun 25, 1981 - [AD 80-26-02](https://openairdocs.org/ad/80-26-02): AFCS/AFC-SS Pitch Function · Learjet 23, 24, 24A and 16 more. Effective Jan 15, 1981 - [AD 80-19-09 R1](https://openairdocs.org/ad/80-19-09-R1): Jet Pumps · Learjet 23, 24, 24A and 20 more. Effective Dec 11, 1980 - [AD 80-07-09](https://openairdocs.org/ad/80-07-09): Cabin Main Entrance Upper Door · Learjet 23, 24, 24A and 20 more. Effective May 1, 1980 - [AD 79-12-05](https://openairdocs.org/ad/79-12-05): Stall Warning Systems · Learjet 24, 24A, 24B and 13 more. Effective Nov 6, 1979 - [AD 78-16-03](https://openairdocs.org/ad/78-16-03): Refrigeration Condenser Fan · Learjet 23, 24, 24A and 18 more. Effective Aug 17, 1978 - [AD 77-19-02](https://openairdocs.org/ad/77-19-02): Cabin Door Locking Mechanism · Learjet 23, 24, 24A and 14 more. Effective Jul 20, 1978 - [AD 75-15-06](https://openairdocs.org/ad/75-15-06): Landing Gear Struts · Learjet 23, 24, 24A and 14 more. Effective Jul 25, 1975 ## Information bulletins (advisory) (3) - [SAIB 2026-07](https://openairdocs.org/saib/2026-07): MAIN LANDING GEAR ATTACH SECTION, Trunnion Pins. Issued Mar 19, 2026 - [SAIB NM-16-24](https://openairdocs.org/saib/NM-16-24): Fuselage: Main Plate/Skin. Issued Sep 15, 2016 - [SAIB NM-13-38](https://openairdocs.org/saib/NM-13-38): Flight Controls Control Column Section. Issued Jun 24, 2013 ## Registered aircraft (20) - [N100WN](https://openairdocs.org/aircraft/N100WN): [Columbus State Community College](https://openairdocs.org/faa-owner/COLUMBUS%20STATE%20COMMUNITY%20COLLEGE), [Columbus, OH](https://openairdocs.org/faa-place/OH/Columbus), built 1979, S/N 288 - [N107RM](https://openairdocs.org/aircraft/N107RM): [Dierolf Robert Scott](https://openairdocs.org/faa-owner/DIEROLF%20ROBERT%20SCOTT), [Carrollton, TX](https://openairdocs.org/faa-place/TX/Carrollton), built 1982, S/N 362 - [N108FL](https://openairdocs.org/aircraft/N108FL): [Wyoming Aviation Specialist Inc](https://openairdocs.org/faa-owner/WYOMING%20AVIATION%20SPECIALIST%20INC), [Green Valley, AZ](https://openairdocs.org/faa-place/AZ/Green%20Valley), S/N 300 - [N111FN](https://openairdocs.org/aircraft/N111FN): [Best Aircraft Deals LLC](https://openairdocs.org/faa-owner/BEST%20AIRCRAFT%20DEALS%20LLC), [Salt Lake City, UT](https://openairdocs.org/faa-place/UT/Salt%20Lake%20City), S/N 293 - [N203VS](https://openairdocs.org/aircraft/N203VS): [Calspan Corp](https://openairdocs.org/faa-owner/CALSPAN%20CORP), [Buffalo, NY](https://openairdocs.org/faa-place/NY/Buffalo), built 1981, S/N 347 - [N25CY](https://openairdocs.org/aircraft/N25CY): [N25cy LLC](https://openairdocs.org/faa-owner/N25CY%20LLC), [West Palm Beach, FL](https://openairdocs.org/faa-place/FL/West%20Palm%20Beach), S/N 272 - [N25NY](https://openairdocs.org/aircraft/N25NY): [Andrews University](https://openairdocs.org/faa-owner/ANDREWS%20UNIVERSITY), [Berrien Springs, MI](https://openairdocs.org/faa-place/MI/Berrien%20Springs), built 1980, S/N 304 - [N25PW](https://openairdocs.org/aircraft/N25PW): [Solomon Mark Trustee](https://openairdocs.org/faa-owner/SOLOMON%20MARK%20TRUSTEE), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington), built 1981, S/N 342 - [N304VS](https://openairdocs.org/aircraft/N304VS): [Calspan Corp](https://openairdocs.org/faa-owner/CALSPAN%20CORP), [Buffalo, NY](https://openairdocs.org/faa-place/NY/Buffalo), built 1981, S/N 354 - [N330L](https://openairdocs.org/aircraft/N330L): [A-C Electric Co](https://openairdocs.org/faa-owner/A-C%20ELECTRIC%20CO), [Bakersfield, CA](https://openairdocs.org/faa-place/CA/Bakersfield), built 1981, S/N 330 - [N4447P](https://openairdocs.org/aircraft/N4447P): [Aviation Management & Repairs Inc](https://openairdocs.org/faa-owner/AVIATION%20MANAGEMENT%20%26%20REPAIRS%20INC), [Fort Pierce, FL](https://openairdocs.org/faa-place/FL/Fort%20Pierce), S/N 338 - [N444TG](https://openairdocs.org/aircraft/N444TG): [American Trans Air Training Corp](https://openairdocs.org/faa-owner/AMERICAN%20TRANS%20AIR%20TRAINING%20CORP), [Virginia Beach, VA](https://openairdocs.org/faa-place/VA/Virginia%20Beach), built 1980, S/N 327 - [N456CG](https://openairdocs.org/aircraft/N456CG): [Ldl Aircraft Leasing LLC](https://openairdocs.org/faa-owner/LDL%20AIRCRAFT%20LEASING%20LLC), [Pittsfield, MA](https://openairdocs.org/faa-place/MA/Pittsfield), built 1981, S/N 343 - [N499BS](https://openairdocs.org/aircraft/N499BS): [National Aviation Academy Of Mississippi Inc](https://openairdocs.org/faa-owner/NATIONAL%20AVIATION%20ACADEMY%20OF%20MISSISSIPPI%20INC), [Clearwater, FL](https://openairdocs.org/faa-place/FL/Clearwater), S/N 239 - [N600GM](https://openairdocs.org/aircraft/N600GM): [Teterboro School Of Aeronautics DBA](https://openairdocs.org/faa-owner/TETERBORO%20SCHOOL%20OF%20AERONAUTICS%20DBA), [Hasbrouck Heights, NJ](https://openairdocs.org/faa-place/NJ/Hasbrouck%20Heights), S/N 290 - [N657BM](https://openairdocs.org/aircraft/N657BM): [Fairway Aviation Leasing Co LLC](https://openairdocs.org/faa-owner/FAIRWAY%20AVIATION%20LEASING%20CO%20LLC), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington), S/N 331 - [N727LM](https://openairdocs.org/aircraft/N727LM): [Lacey Doug DBA](https://openairdocs.org/faa-owner/LACEY%20DOUG%20DBA), [Laredo, TX](https://openairdocs.org/faa-place/TX/Laredo), S/N 25D308 - [N890MJ](https://openairdocs.org/aircraft/N890MJ): [Jensen Mark A](https://openairdocs.org/faa-owner/JENSEN%20MARK%20A), [Dallas, TX](https://openairdocs.org/faa-place/TX/Dallas), built 1977, S/N 229 - [N988AA](https://openairdocs.org/aircraft/N988AA): [Dodson International Parts Inc](https://openairdocs.org/faa-owner/DODSON%20INTERNATIONAL%20PARTS%20INC), [Rantoul, KS](https://openairdocs.org/faa-place/KS/Rantoul), built 1981, S/N 348 - [N988AS](https://openairdocs.org/aircraft/N988AS): [Dutchess Community College](https://openairdocs.org/faa-owner/DUTCHESS%20COMMUNITY%20COLLEGE), [Poughkeepsie, NY](https://openairdocs.org/faa-place/NY/Poughkeepsie), S/N 257 ## NTSB investigations (8) From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [NTSB CEN15WA082](https://openairdocs.org/ntsb/CEN15WA082), Dec 19, 2014: Gates Learjet 25D (N265TW), Champoton, Mexico, substantial damage, 2 fatal - [NTSB LAX06CA028](https://openairdocs.org/ntsb/LAX06CA028), Oct 27, 2005: Learjet 25D (N888DV), Sacramento, CA, substantial damage. Probable cause: the pilot's failure to extend the landing gear and to verify they were in the down and locked position prior to touchdown. A related factor was his diverted attention. - [NTSB CHI01MA163](https://openairdocs.org/ntsb/CHI01MA163), Jun 12, 2001: Learjet 25D (N333CG), Salina, KS, destroyed. Probable cause: The PIC's delayed remedial action during the elevator system oscillation, resulting in the failure of the aft elevator sector clevis due to reverse bending fatigue caused by vibration, and subsequent… - [NTSB FTW93FA255](https://openairdocs.org/ntsb/FTW93FA255), Sep 5, 1993: Gates Learjet 25D (N999BH), Pecos, NM, destroyed, 7 fatal. Probable cause: WAS PHYSICAL IMPAIRMENT OF THE PILOT IN COMMAND FROM ALCOHOL AND DRUGS. A FACTOR WAS THE FIRST OFFICER'S LACK OF EXPERIENCE IN THE LEAR JET. - [NTSB NYC85LA056](https://openairdocs.org/ntsb/NYC85LA056), Jan 21, 1985: Gates Learjet 25D (N212NE), Johnstown, PA, substantial damage - [NTSB DEN84LA046](https://openairdocs.org/ntsb/DEN84LA046), Dec 22, 1983: Gates Learjet 25D (N300PL), Eagle, CO, substantial damage - [NTSB DCA80AA018](https://openairdocs.org/ntsb/DCA80AA018), May 19, 1980: Learjet 25D (N125NE), Gulf Of Mexico (Gulf of Mexico), destroyed, 2 fatal - [NTSB DCA79AA007](https://openairdocs.org/ntsb/DCA79AA007), Jan 19, 1979: Lear Jet 25D (N137GL), Detroit, MI, destroyed, 6 fatal ## FAA accident and incident reports (31) From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [Incident 20120315006189I](https://openairdocs.org/incident/20120315006189I), Mar 15, 2012: Gates Learjet 25D (N125JW), Teterboro, NJ, Minor damage. At approximitly 13:47 local, a lear jet 25D registration N125JW departed Teterboro (kteb) IFR rwy 6 teb 8 SID with destination to peachtree (kpdk), (2 pax, 2… - [Incident 20110610013399I](https://openairdocs.org/incident/20110610013399I), Jun 10, 2011: Gates Learjet 25D (N43DR), Addison, TX, No damage. On June 10, 2011 at approximately 14:42 csd a Gates lear 25 was turning off of the active runway at Addison airport in Addison, Texas. The aircraft experienced… - [Incident 20100212028529I](https://openairdocs.org/incident/20100212028529I), Feb 12, 2010: Gates Learj 25D (N43DR), Sugarland, TX, Minor damage. On February 11, 2010, aircraft N43DR had maintenance performed on the nose gear steering. The computer component that controls the nose wheel steering was… - [Incident 20080820855719I](https://openairdocs.org/incident/20080820855719I), Aug 20, 2008: Lear 25D (N4447P), Tallahassee, FL, Minor damage. (-23) While on takeoff roll from runway 9 at tallahessee regional airport, the right main landing gear outboard tire failed. Debris from such tire struck the… - [Incident 20070301002479I](https://openairdocs.org/incident/20070301002479I), Mar 1, 2007: Lear 31A (N181PA), Fort Smith, AR, Minor damage. (-23) Aircraft received maintenance at the springdale, AR facility prior to flight. Maintenance crew did not secure left engine cowling properly, PIC did not… - [Incident 20060228001799I](https://openairdocs.org/incident/20060228001799I), Feb 28, 2006: Lear 25D (N242GS), Albuquerque, NM. (-23) On February 28, 2006, at 1315 MST, a Lear 25, N242GS, registered to outrageous bluewater, overran the end of the runway on landing at Double Eagle… - [Accident 20051026028499A](https://openairdocs.org/incident/20051026028499A), Oct 26, 2005: Lear 25D (N888DV), Sacramento, CA, Substantial damage. (-23) The flight departed kmhr enroute to kmcc. The crew entered the traffic pattern to runway 16 and initiated the before landing checklist. The crew became… - [Incident 20041030033899I](https://openairdocs.org/incident/20041030033899I), Oct 30, 2004: Lear 25D (N25UJ), Ft Lauderdale, FL, Minor damage. (-23) On runway 08 at the fort Lauderdale executive airport (fxe) on October 30, 2004 at approximately 2100 local time, [privacy data omitted] was PIC of… - [Incident 20040805025529I](https://openairdocs.org/incident/20040805025529I), Aug 5, 2004: Lear 25D (N207HF), Oxford, NC. (-23) On August 5, 2004, approximately 1017 EDT, a Learjet 25D registered to chipola aviation, inc, a FAR 135 operator, p.o. box 875, marianna, FL. 32447-0875… - [Incident 20020802037229I](https://openairdocs.org/incident/20020802037229I), Aug 2, 2002: Lear 25D (N75CK), Buffalo, NY. (-23) On Friday August 2, 2002, a Learjet 25, N75CK, operated by kalitta charters, inc, during approach to dunkirk, new york, the flight crew experienced an… - [Incident 20020309006329I](https://openairdocs.org/incident/20020309006329I), Mar 9, 2002: Lear 25D (N140GC), Indianapolis, IN. (-23) 03/09/2002 N140GC a Learjet 25 operated by global air charter inc (G2CA) enroute from lan to lit diverted to ind due to #2 engine failure. An emergency… - [Accident 20010612019219A](https://openairdocs.org/incident/20010612019219A), Jun 12, 2001: Lear 25D (N333CG), Salina, KS, No damage. (-23) During a flight test to establish baseline data, the aircraft experienced elevator flutter of sufficient magnitude to sever the elevator controllinkage.… - [Incident 20000702033609I](https://openairdocs.org/incident/20000702033609I), Jul 2, 2000: Lear 25D (N85TW), Pittsburgh, PA. (-23)The aircraft landed on runway 28L at pit after reporting an electrical problem. The problem was traced to a bad starter generator, it was replaced, and… - [Incident 20000225003849I](https://openairdocs.org/incident/20000225003849I), Feb 25, 2000: Lear 25D (N825D), Atlanta, GA, Minor damage. (.23)Inspector's statement: on feb. 25, 2000, a Learjet 25D ran off the runway at Fulton county (fty) airport and traveled approximately 500 ft. beofre coming… - [Incident 19990409003349I](https://openairdocs.org/incident/19990409003349I), Apr 9, 1999: Lear 25D (N988AS), Omaha, NE, Minor damage. Airstar international air ambulance struck several seagulls on take-off and both engines sustained substantial damage, no injuries were reported to the 2 POB,… - [Incident 19981010041559I](https://openairdocs.org/incident/19981010041559I), Oct 10, 1998: Lear 25D (N531CW), Cleveland, OH. (-5) Aircraft crossed 1st set of hold short lines of taxiway "w", but the nose was short of second set of lines. Aircraft on final approach was sent around. - [Incident 19931221050859I](https://openairdocs.org/incident/19931221050859I), Dec 21, 1993: Lear 25D (N100WN), Syracuse, NY, Minor damage. Struck a large chunk of frozen slush left by plowing operations. Right gear broke off. Slid off the runway. - [Accident 19930905033549A](https://openairdocs.org/incident/19930905033549A), Sep 5, 1993: Lear 25D (N999BH), Pecos, NM, Destroyed, 7 fatal. Observed buzzing area prior impact on a hill. PIC passengers positive for cocaine and alchol consumed on flight. - [Incident 19930211004219I](https://openairdocs.org/incident/19930211004219I), Feb 11, 1993: Lear 25D (N531CW), Columbus, OH. Unsafe nose gear light. On landing rollout main gear tires went flat. Brakes lockd up. Broken wire on nose light. - [Incident 19920801056639I](https://openairdocs.org/incident/19920801056639I), Aug 1, 1992: Lear 25D (N261WC), Saint John Nb, CN. Aircraft departed airport in weather below canadian minimums. No injuries or damage occured. - [Incident 19911127059669I](https://openairdocs.org/incident/19911127059669I), Nov 27, 1991: Lear 25D (N55SL), Kansas City, MO. Left essential and essential bus breakers both opened on descent. Unable to reset. Replaced breakers. - [Incident 19910517032209I](https://openairdocs.org/incident/19910517032209I), May 17, 1991: Lear 25D (N228SW), Dallas, TX, Minor damage. Bird strike on left engine during takeoff. Returned. Landed safely. Duck ingested in engine. - [Incident 19910118006009I](https://openairdocs.org/incident/19910118006009I), Jan 18, 1991: Lear 25B (N25RE), Lake Charles, LA, Minor damage. Lost directional control on a high crosswind landing. Veered off side of runway. - [Incident 19900419016319I](https://openairdocs.org/incident/19900419016319I), Apr 19, 1990: Lear 25D (N55SL), Tulsa, OK. Left engine flamed out on climb. Descended and restarted it. Landed at destination. Compressor blades worn short - [Incident 19880907055389I](https://openairdocs.org/incident/19880907055389I), Sep 7, 1988: Lear 35A (N35DL), New York, NY. Pilot reported unsafe gear indication on final approach. Landed safely. Cause not stated. - [Incident 19870104001359I](https://openairdocs.org/incident/19870104001359I), Jan 4, 1987: Lear 25D (N211JC), Latrobe, PA, Minor damage. Aircraft was not properly aligned to runway at touchdown. Plane departed side of runway into snowbank. Ground fog. - [Incident 19850314019719I](https://openairdocs.org/incident/19850314019719I), Mar 14, 1985: Lear 25D (N25TZ), El Paso, TX, Minor damage. Nose gear retracted when master was turned off. Small piece of metal lodged in gear selector valve. - [Accident 19850121000989A](https://openairdocs.org/incident/19850121000989A), Jan 21, 1985: Lear 25D (N212NE), Johnstown, PA, Substantial damage. Hit snowbank (.4)the acft overran the end of rwy 33 during an aborted takeoff. During the takeoff ground run the acft inadvertently became airborne at an… - [Accident 19831222063029A](https://openairdocs.org/incident/19831222063029A), Dec 22, 1983: Lear 25D (N300PL), Eagle, CO, Substantial damage. Jet aircraft ran off end of runway during landing on snow covered runway. - [Accident 19800519014169A](https://openairdocs.org/incident/19800519014169A), May 19, 1980: Lear 25D (N125NE), Sarasota, FL, Destroyed. Clear air turbulence. Indicates loss of control, improper emergency procedures. Spun in. Overspeed horn silenced. - [Accident 19790119044289A](https://openairdocs.org/incident/19790119044289A), Jan 19, 1979: Lear 25D (N137GL), Romulus, MI, Destroyed, 4 fatal. During landing aircraft observed rolling from one wing to another. Wing tank touched and airplane cart-wheeled. ## Service difficulty reports (71, newest 50) As reported by operators and repair stations, by the model named in the report. - [SDR SUZA121010001](https://openairdocs.org/sdr/SUZA121010001), Oct 10, 2012: DISPLAY. DEFECTIVE. AT APPROX 2310Z, NOTICED THE DIGITS ON THE DME BEGAN TO FLICKER THEN NOTICED THE DISPLAY WENT BLANK AFTER ABOUT 30 SECONDS. SMELLED AND SAW LIGHT SMOKE. THE SME - [SDR SUZA20120501001](https://openairdocs.org/sdr/SUZA20120501001), Apr 27, 2012: PRESSURE SYSTEM. MALFUNCTIONED. ON 4/27/2012 AT ABOUT 12:00PM EASTERN STANDARD TIME, THE PILOT PULLED THE POWER BACK TO DESCEND FROM FLIGHT LEVEL 430 AND THE CABIN ALTITUDE BEGAN TO CLIMB. THE - [SDR ZP7A2010F00117](https://openairdocs.org/sdr/ZP7A2010F00117), May 26, 2010: ENGINE. BIRD INGESTION. BIRD WAS INGESTED INTO LEFT ENGINE JUST AFTER V-1. ENGINE FLAMED OUT, TAKE OFF WAS CONTINUED TO A SAFE ALTITUDE. CREW DECLARED AN EMERGENCY ON CTAF AND RETURNED - [SDR 2007FA0000835](https://openairdocs.org/sdr/2007FA0000835), Aug 2, 2007: ADJUSTER. DAMAGED. UPON VISUAL INSPECTION OF THE POWER BRAKE VALVE PN 60810741-804, SN 9711105, IT WAS FOUND THAT THE ADJUSTMENT SCREW HAD BEEN GROUND DOWN AND MODIFIED. AS WE BEG - [SDR CJP2006F00000](https://openairdocs.org/sdr/CJP2006F00000), Nov 17, 2006: BALL JOINT. OUT OF ADJUST. NR 1 ENGINE FLAMED OUT WHEN THROTTLED TO IDLE FOR DESCENT. ENGINE WAS SUCCESSFULLY AIR STARTED. UPON LANDING THROTTLES WERE RETARDED AND NR 1 ENGINE FLAMED OUT - [SDR 7032005N213CA](https://openairdocs.org/sdr/7032005N213CA), Jul 3, 2005: HOSE. KINKED. ENROUTE, UPON THE AIRCRAFT REACHING ITS ASSIGNED LEVEL OF FL 430 POWER WAS REDUCED FOR CRUISE AND THE NR 2 ENGINE QUIT. AIRCRAFT DESCENDED TO FL 250 AND THE ENG - [SDR KC82005F00004](https://openairdocs.org/sdr/KC82005F00004), Nov 18, 2004: STARTER GEN. VIBRATION. CREW FELT VIBRATION IN AIRCRAFT DURING CRUISE FLIGHT. FOUND RT STARTER GEN WAS CAUSING VIBRATION. REPLACED STARTER GEN WITH REPAIRED ASSEMBLY. PERFORMED ENGINE - [SDR 4020](https://openairdocs.org/sdr/4020), Aug 13, 2004: WARNING LIGHT. ILLUMINATED. ON APPROACH INTO CLT RIGHT ENGINE FIRE LIGHT CAME ON, FIRST STARTED FLICKERING THEN CAME ON STEADY. REDUCED POWER LIGHT WENT OUT, THEN CAME BACK ON AND STAYED O - [SDR 4019](https://openairdocs.org/sdr/4019), Aug 13, 2004: WARNING LIGHT. ILLUMINATED. ON APPROACH INTO CLT RIGHT ENGINE FIRE LIGHT CAME ON, FIRST STARTED FLICKERING THEN CAME ON STEADY. REDUCED POWER LIGHT WENT OUT, THEN CAME BACK ON AND STAYED O - [SDR YDB2004FBBB](https://openairdocs.org/sdr/YDB2004FBBB), Jul 21, 2004: TUBE. UNSERVICEABLE. PILOT REPORTED BRAKES WERE VERY WEAK ON LANDING ROLL OUT. FOUND LARGE AMOUNT OF HYDRAULIC FLUID ON AFT PORTION OF AIRCRAFT BELLY. T/S AND FOUND LT ENGINE HYDRAU - [SDR KC82004F00000](https://openairdocs.org/sdr/KC82004F00000), Jan 12, 2004: LINE. FAILED. COMPLETE HYDRAULIC FAILURE OF THE NORMAL SYSTEM AFTER GEAR EXTENSION. AUXILIARY SYSTEM WORKED NORMALLY. FOUND HYDRAULIC LINE FROM LT ENGINE DRIVEN HYDRAULIC PUM - [SDR 2003006](https://openairdocs.org/sdr/2003006), Dec 17, 2003: ENGINE. MALFUNCTIONED. DURING FLT AT APPROXIMATELY 2:00 AM, AIRCRAFT WAS ENROUTE WHEN THE PILOT NOTICED THAT THE LT ENGINE OIL PRESSURE WAS DECREASING. THE PILOT ALSO NOTICED THAT THE - [SDR 2004F00015](https://openairdocs.org/sdr/2004F00015), Nov 19, 2003: RIVET. LOOSE. AIRCRAFT WAS EN ROUTE FROM BUFFALO, NY TO PONTIAC, MI AND GOT AN INDICATION OF A FIRE ON THE NR 2 ENGINE. PILOT DECLARED AN EMERGENCY AND LANDED AT MTC SELFRIDG - [SDR 2004F00033](https://openairdocs.org/sdr/2004F00033), Sep 2, 2003: LAMP. BURNED OUT. ON FINAL APPROACH INTO ROCHESTER, NY, THE FLIGHT CREW NOTICED THE GREEN NOSE GEAR LIGHT WAS NOT ILLUMINATED. AFTER DETERMINING THE LIGHT WAS BURNED OUT AND THE - [SDR 081903](https://openairdocs.org/sdr/081903), Aug 13, 2003: SWITCH. OUT OF RIG. AFTER DEPARTURE THE GEAR WOULD NOT RETRACT, THE AIRCRAFT RETURNED TO THE AIRPORT WITHOUT AN INCIDENT. AFTER INVESTIGATION, THE LEFT GEAR DOOR SWITCH WAS OUT OF - [SDR 2003FA0001156](https://openairdocs.org/sdr/2003FA0001156), Jul 11, 2003: STARTER. VIBRATION. WHILE IN CRUISE FLIGHT AT 370, THE FLIGHT CREW HEARD TWO FLUTTERING VIBRATION SOUNDS. THE VIBRATION NOISES BECAME LOUDER AND LOUDER. ADJUSTING THE THROTTLE ISOL - [SDR 071403](https://openairdocs.org/sdr/071403), Jul 10, 2003: ACTUATOR. INOPERATIVE. AIRCRAFT UPON LANDING DID NOT HAVE A LEFT GREEN LIGHT DOWN AND LOCKED. AFTER THE AIRCRAFT LANDED, MAINTENANCE DETERMINED THAT THE LEFT ACTUATOR WAS THE PROBLEM, - [SDR CJP2003F00003](https://openairdocs.org/sdr/CJP2003F00003), Jun 19, 2003: ANTI-SKID SYS. OUT OF TOLERANCE. FLIGHT CREW REPORTED DISPROPORTIONED BRAKE (EFFECTIVENESS) ON LANDING, AT LOW SPEED. REMOVED AND REPLACED ANTI-SKID PRESSURE CONTROL VALVE WITH SERVICEABLE VALV - [SDR KC82003F00000](https://openairdocs.org/sdr/KC82003F00000), Jan 31, 2003: CASE. WARPED. FOUND EXHAUST CASE FORWARD FLANGE WARPED CAUSING EXHAUST LEAKAGE AND A FALSE FIRE WARNING. REPLACED EXHAUST CASE WITH OVERHAULED CASE SN GGM1158. TESTED FIRE LO - [SDR ESUA116360](https://openairdocs.org/sdr/ESUA116360), Sep 13, 2002: LINE. LOOSE. PILOT DECLARED AN EMERGENCY ON APPROACH, IT WAS DISCOVERED THAT THE HYDRAULIC PRESSURE INDICATED (0). THE GEAR WAS ABLE TO BE PLACED IN THE DOWN AND LOCKED POSI - [SDR 091302](https://openairdocs.org/sdr/091302), Sep 13, 2002: HYDRAULIC LINE. LOOSE. PILOT DECLARED AN EMERGENCY ON APPROACH INTO DALLAS LOVE FIELD. IT WAS DISCOVERED THAT THE HYDRAULIC PRESSURE INDICATED O. THE GEAR WAS ABLE TO BE PLACED IN THE - [SDR ESY2002F00000](https://openairdocs.org/sdr/ESY2002F00000), Aug 15, 2002: ENGINE. FAILED. FIFTEEN MINUTES AFTER TAKE-OFF, EXPERIENCED FAILURE OF RT ENGINE, WHILE CLIMBING, LEAVING, EVERYTHING WAS NORMAL. NO PREVIOUS ENG ABNORMALITY HAD BEEN NOTED. AT - [SDR CJP2002F00002](https://openairdocs.org/sdr/CJP2002F00002), Jul 1, 2002: CONNECTOR. CONTAMINATED. NR 2 ENGINE FIRE WARNING LIGHT CAME ON IN FLIGHT. AIRCRAFT LANDED AFTER NR 2 ENGINE WAS SHUTDOWN IN FLIGHT AS A PRECAUTION. MAINTENANCE PERSONNEL DISCONNECTED, - [SDR CJP2002F00001](https://openairdocs.org/sdr/CJP2002F00001), Jul 1, 2002: CONNECTOR. CONTAMINATED. NR 2 ENGINE FIRE WARNING LIGHT CAME N IN FLIGHT. AIRCRAFT LANDED AFTER NR 2 ENGINE WAS SHUTDOWN IN FLIGHT AS A PRECAUTION. MAINTENANCE PERSONNEL DISCONNECTED, C - [SDR KC82002F00002](https://openairdocs.org/sdr/KC82002F00002), Jun 19, 2002: HYDRAULIC LINE. CRACKED. AIRCRAFT LOST HYDRAULIC PRESSURE AFTER CREW SELECTED THE GEAR DOWN. THE GEAR HAD 3 GREEN DOWN AND LOCKED INDICATIONS AND 2 RED UNSAFE INDICATIONS. THE AIRCRAFT - [SDR KC82002F00001](https://openairdocs.org/sdr/KC82002F00001), May 30, 2002: FILTER. DIRTY. CABIN WOULD NOT PRESSURIZE. CLEANED PRESSURIZATION JET PUMP FILTER. PERFORMED GROUND PRESSURIZATION CHECK PER MFG MM. AIRCRAF TEST FLOWN AND FOUND SATISFACTORY. - [SDR IKM2002F00001](https://openairdocs.org/sdr/IKM2002F00001), Apr 5, 2002: WHEEL. CRACKED. WHEEL, CRACKED, BEAD SEAL AREA. - [SDR KC82002F00000](https://openairdocs.org/sdr/KC82002F00000), Feb 13, 2002: CONNECTOR. LOOSE. PRIMARY PITCH TRIM WILL NOT PITCH UP. TIGHTENED LOOSE CONNECTOR PLUG AT TWO SPEED TRIM BOX AND RE-SAFTIED. FUNCTIONAL CHECK OF TRIM SYSTEM COMPLIED WITH PER MFG - [SDR IY22002F00000](https://openairdocs.org/sdr/IY22002F00000), Dec 13, 2001: STRUCTURE. CORRODED. DURING PREPARATION OF AIRCRAFT FOR PAINT, CORROSION WAS FOUND ON THE TOP OF THE LEFT WING BETWEEN WING STATIONS 125.00 TO 181.10 AND SPAR NR 5 TO 8 UNDER A RAIS - [SDR CJP2001F00000](https://openairdocs.org/sdr/CJP2001F00000), Jun 22, 2001: HYDRAULIC LINE. CHAFED. TUBE ASSEMBLY WAS FOUND CHAFED DURING A SCHEDULED INSPECTION OF HYDRAULIC PLUMBING IN TAILCONE. THE TUBE ASSEMBLY WAS REPLACED WITH A NEW TUBE ASSEMBLY. AIRCRAF - [SDR 20010613CW001](https://openairdocs.org/sdr/20010613CW001), May 22, 2001: DIODE. FAILED. FLAP CIRCUIT BREAKER POPS WHEN FLAPS ARE SELECTED DOWN. CORRECTIVE ACTION: FOUND DIODE ON TB-28 IN RIGHT MAIN LANDING GEAR. WHEEL WELL SHORTED. INSTALLED NEW DI - [SDR 20010529CW009](https://openairdocs.org/sdr/20010529CW009), May 10, 2001: CONTROL BOX. MALFUNCTIONED. RIGHT ENGINE FIRE LIGHT ON IN FLIGHT. TROUBLESHOOTING PER MM. ALL CIRCUITS TESTED GOOD. REPLACED FIRE DETECT CONTROL BOX. - [SDR 20010514CW005](https://openairdocs.org/sdr/20010514CW005), Apr 17, 2001: STARTER GEN. VIBRATES. FLIGHT CREW EXPERIENCED AN AIRFRAME RUMBLE DURING TAKEOFF AND OPTED TO RETURN TO LANDING. MAINTENANCE CONFIRMED THE RUMBLE DURING GROUND RUN AND DETRMINED THE L - [SDR 20010213CW011](https://openairdocs.org/sdr/20010213CW011), Jan 9, 2001: CONTROL UNIT. FAILED. PRIOR TO START, PILOT NOTED SMOKE AND BURNT ODOR IN AREA OF THROTTLE QUADRANT WITH SHIPS BATTERIES ON.MAINTENANCE DID TROUBLESHOOT AND DISCOVERED ODOR TO BE FRO - [SDR 20010205CW013](https://openairdocs.org/sdr/20010205CW013), Jan 9, 2001: HYDRAULIC LINE. CHAFED. PILOT LOST HYDRAULIC PRESSURE IN FLIGHT. INSPECTION REVEALED HYDRAULIC PRESSURE LINE FROM LEFT ENGINE TO AUXILLARY HYDRALUIC PUMP MANIFOLD LINE, CHAFFED AT CLAM - [SDR 20000816SH024](https://openairdocs.org/sdr/20000816SH024), Aug 4, 2000: FUEL CONTROL. MALFUNCTIONED. ON DESCENT TO SLN, ENGINE FLAMED OUT. RE-LIGHT NORMAL AT ALTITUDE 250. INSPECTED ENGINE PER SEI 186. REMOVED AND REPLACED FUEL CONTROL. TEST FLIGHT PERFORMED, N - [SDR 20001016SH006](https://openairdocs.org/sdr/20001016SH006), Aug 3, 2000: CONTROL UNIT. MALFUNCTIONED. CMH - LOST CABIN PRESSURIZATION AFTER DEPARTURE OUT OF COLUMBUS. RETURNED TO CMH. INSPECTED BLEED AIR LINES IN HEX HOSE AND IN CABIN, RAN BOTH ENGINES, NO LEAKS - [SDR 20000808SH033](https://openairdocs.org/sdr/20000808SH033), Jul 26, 2000: ACTUATOR. MALFUNCTIONED. RIGHT MAIN LANDING GEAR DOWN AND LOCKED LIGHT FAILED TO ILLUMINATE IN-FLIGHT DURING APPROACH. THE AIRCRAFT LANDED WITHOUT INCIDENT. INSPECTION OF RIGHT MAIN GEA - [SDR 20000424SH020](https://openairdocs.org/sdr/20000424SH020), Mar 20, 2000: ENGINE. FLAMED OUT. DURING FLIGHT AT ALTITUDE OF 41,000 FEET, RIGHT HAND ENGINE FLAMED OUT. AIRCRAFT WAS CHECKED FOR FOD. AIRCRAFT RETURNED TO P.S.P. AT LOWER ALTITUDE. ENGINE REMO - [SDR 20000329SH039](https://openairdocs.org/sdr/20000329SH039), Mar 2, 2000: WARNING LIGHT. ILLUMINATED. EN ROUTE, RIGHT ENGINE FIRE WARNING LIGHT ILLUMINATED BRIEFLY. DIVERTED FLIGHT. FALSE ENGINE FIRE WARNING, CHAFED WIRE. (X) - [SDR 20000329SH050](https://openairdocs.org/sdr/20000329SH050), Jan 10, 2000: STARTER GEN. FAILED. DURING FLIGHT ON 1-10-2000, PILOT NOTICED VIBRATION IN AIRCRAFT, SHORTLY THEREAFTER, GENERATOR OFF-LINE. PILOT LANDED AIRCRAFT AT GJT. STARTER/GENERATOR WAS REP - [SDR 20000329SH049](https://openairdocs.org/sdr/20000329SH049), Dec 15, 1999: ENGINE. FLAMED OUT. AIRCRAFT AT 43,000 CRUISE M.780, RT ENGINE ROLL BACK RE-LIGHT AT 35,000. PERFORMED INSPECTION OF BLEED AIR SYSTEM, COMPRESSOR FOR FOD. NONE NOTED. PERFORMED MAX - [SDR 99ZZZX4445](https://openairdocs.org/sdr/99ZZZX4445), Nov 17, 1999: FITTING. LEAKING. AFTER AN UNEVENTFUL LANDING, THE FLIGHT CREW NOTED HYDRAULIC FLUID LEAKING FROM THE AIRCRAFT BELLY. MAINTENANCE PERSONNEL DISCOVERED A LOOSE JAM NUT ON A FITTIN - [SDR 99ZZZX4068](https://openairdocs.org/sdr/99ZZZX4068), Oct 8, 1999: BRAKE ASSY. MISOVERHAULED. PART INSTALLED ON AIRCRAFT, BUT WHEN THROUGH-BOLTS WERE TORQUED, BRAKE ASSY (ROTORS) WOULD NOT MOVE FREELY. FOUND DISTANCE BETWEEN BACKPLATE AND PRESSURE PLATE - [SDR 99ZZZX3573](https://openairdocs.org/sdr/99ZZZX3573), Sep 7, 1999: SQUAT SWITCH. FAILED. THE LANDING GEAR RETRACTED, BUT WOULD NOT EXTEND WITH HYDRAULIC PRESSURE, ALTERNATE GEAR EXTENSION WAS USED AND THE GEAR EXTENDED. TROUBLESHOOTING REVEALED THE - [SDR 99ZZZX3496](https://openairdocs.org/sdr/99ZZZX3496), Aug 30, 1999: LINE. CRACKED. THE LEFT ENGINE HYDRAULIC PRESSURE LINE CRACKED UNDER AN ADEL CLAMP THAT SECURED THE LINE TO THE AIRCRAFT STRUCTURE LOCATED ABOVE AND AFT OF THE GENERATOR CONTR - [SDR 20000714SH003](https://openairdocs.org/sdr/20000714SH003), Apr 28, 1999: HYDRAULIC LINE. CHAFED. THE LEFT ENGINE HYDRAULIC LINE RUPTURED DUE TO WEAR AGAINST ANOTHER HYDRAULIC LINE''S FITTINGS. THE LINE IS LOCATED AT THE AFT PRESSURE BULKHEAD. SUBMITTER STAT - [SDR 99ZZZX2176](https://openairdocs.org/sdr/99ZZZX2176), Apr 28, 1999: LINE. RUPTURED. HYDRAULIC PRESSURE LINE RUPTURED IN-FLIGHT DUE TO 'RUBBING' AGAINST ANOTHER HYDRAULIC LINE'S FITTINGS. THE RUPTURE CAUSED A LOSS OF HYDRAULIC SYSTEM PRESSURE AN - [SDR 99ZZZX1918](https://openairdocs.org/sdr/99ZZZX1918), Apr 21, 1999: FIRE LOOP. MALFUNCTIONED. INTERMITTENT FIRE LIGHT RIGHT SIDE. RE-POSITIONED FIRE DETECT LOOP, WAS MAKING CONTACT WITH COWLING. DETECT SYSTEM OPERATIONALLY, CHECKS GOOD. - [SDR 99ZZZX2418](https://openairdocs.org/sdr/99ZZZX2418), Apr 9, 1999: RADIO. MALFUNCTIONED. REPLACED NR 1 COMM ANTENNA WITH NEW UNIT, PN VF10-347, SN 414. REPAIRED COAX END AT FRAME NR 5 FOR NR 2 COMM AND REPLACED NR 2 COMM WITH SERVICEABLE UNIT MODEL All 71: https://openairdocs.org/model/gates-learjet-25d/reports.md ## STCs that may be installed (OpenAirDocs) (100, first 50) Approved for this model: the STC's model list names it on its data sheet, or a series that includes it. In force first, then newest. The registry doesn't record which STCs an aircraft has. - [STC ST01305WI-D](https://openairdocs.org/stc/ST01305WI-D): Modification of a Collins ALT-50A or ALT-55B Radio Altimeter system installation to a Collins ALT-1000 or ALT-4000 Radio Altimeter system installation in accordance with Collins Drawing Index as listed on AML No. ST01305WI-D, Revision -, or later FAA approved revision. Rockwell Collins Inc - [STC SA2622NM](https://openairdocs.org/stc/SA2622NM): Installation of Precise Flight Pulselite Control Unit in landing/taxi system. (767-200 B17) (DHC-8 101). Precise Flight Inc - [STC ST03885AT](https://openairdocs.org/stc/ST03885AT): Installation of an Avionica, Inc. avCM Cellular Module. Aircraft Systems and Manufacturing Inc - [STC ST12087CH](https://openairdocs.org/stc/ST12087CH): Installation replacement Cabin/Cockpit Handheld Fire Extinguishers. Avcon Industries Inc - [STC ST02097SE](https://openairdocs.org/stc/ST02097SE): Installation of replacement circuit boards for the FC-110 autopilot. Symetric Industries, DBA Extant Aerospace - [STC ST02416SE](https://openairdocs.org/stc/ST02416SE): Installation of the replacement rate gyro, Butler National Part Number 501-1169-01 MOD A or 501-1169-02 MOD A. Symetric Industries, DBA Extant Aerospace - [STC ST02417SE](https://openairdocs.org/stc/ST02417SE): Installation of the replacement stall warning vertical accelerometer, Butler National Part Number 02904001-101. Symetric Industries, DBA Extant Aerospace - [STC ST02472AT](https://openairdocs.org/stc/ST02472AT): Installation of a mini Quick Access Recorder (QAR) model MKI, MKII, or MKIII. Aircraft Systems and Manufacturing Inc - [STC ST00738WI](https://openairdocs.org/stc/ST00738WI): Increased service life. Data required. Phoenix Air Group Inc - [STC ST01936WI](https://openairdocs.org/stc/ST01936WI): Installation of LED lights. AeroLED's Holdings LLC - [STC ST01138DE](https://openairdocs.org/stc/ST01138DE): Installation of MidContinent MD23 standby altimeter and/or attitude indicators. Butler National Corporation - [STC ST04728NY](https://openairdocs.org/stc/ST04728NY): Installation of LAI CoolView Cabin Window. Lee Aerospace Inc - [STC ST00814WI](https://openairdocs.org/stc/ST00814WI): Landing Gear Life Extension. Phoenix Air Group Inc - [STC ST00999WI](https://openairdocs.org/stc/ST00999WI): Installation of Special Mission Power and Control Wiring, provisions for Carriage of Mission Stores with Hardpoints installed by STC SA1604SO or SA1670CE, and Takeoff weight increased to 16,300 lbs. Phoenix Air Group Inc - [STC ST03424CH](https://openairdocs.org/stc/ST03424CH): Certification of Automatic Dependent Surveillance - Broadcast (ADS-B) Out System with Rockwell Collins TDR-94/-94D Transponders. CMD Flight Solutions LLC - [STC ST04575AT](https://openairdocs.org/stc/ST04575AT): Installation of the Rockwell Collins ALT-1000+/ -4000+ with 5G Filtering. Chippewa Aerospace Inc - [STC ST01682WI](https://openairdocs.org/stc/ST01682WI): Installation of Heads Up Technologies (HUT) Cabin Entertainment System (CES). Heads Up Technologies Inc - [STC ST00098IB](https://openairdocs.org/stc/ST00098IB): Introduction of ADS-B Out. STC Twenty One Limited - [STC ST02004WI](https://openairdocs.org/stc/ST02004WI): Installation of the Garmin GI-275 Instantaneous Vertical Speed Indicators (IVSI). Peregrine - [STC ST02230SE](https://openairdocs.org/stc/ST02230SE): The installation of dual Garmin GTX-33ES Mode-S transponders and single or dual Garmin GTN 650/750 panel mounted navigation and global positioning system (GPS) units, or dual Garmin GTX-335R and/or GTX-345R Mode-S transponders and single or dual Garmin GTN 650/750/625/725 panel mounted navigation and GPS units. Butler National Corporation - [STC ST01930LA](https://openairdocs.org/stc/ST01930LA): Installation of Sandel Avionics SN4500 Electronic Horizontal Situation Indicator (EHSI). Sandel Avionics LLC - [STC ST04177AT](https://openairdocs.org/stc/ST04177AT): Installation of a Talon Aerospace LED Replacement General Purpose Lamps. Aaxico Technical Services Inc - [STC ST02635LA](https://openairdocs.org/stc/ST02635LA): Modification to replace the existing Mode S Transponder system with the ACSS NXT-600 Mode S Transponder with ADS-B Out. Aviation Communication and Surveillance Systems (ACSS) LLC - [STC ST02681AT-D](https://openairdocs.org/stc/ST02681AT-D): Installation of Cockpit / Cabin Blower Assy. Summit Aviation Inc - [STC SA01452CH](https://openairdocs.org/stc/SA01452CH): Installation of an air ambulance conversion kit. Med-Pac Inc - [STC ST04340NY](https://openairdocs.org/stc/ST04340NY): Installation of TCAS 7.1 (ACAS II) upgrade of Prior Existing TCAS 7.0. Scandinavian Avionics Design ApS - [STC ST00835DE](https://openairdocs.org/stc/ST00835DE): Installation of Automatic Dependent Surveillance - Broadcast (ADS-B) Out and In functionality using the Garmin GTX 335R and GTX 345R Transponders plus qualified position sensor. Peregrine - [STC SA1670SW](https://openairdocs.org/stc/SA1670SW): Installation of engine thrust reversers. The NORDAM Group LLC - [STC ST10472SC](https://openairdocs.org/stc/ST10472SC): Replacement Thrust Reverser Accumulator for the TR3000 Thrust Reverser System. The NORDAM Group LLC - [STC SA4999NM](https://openairdocs.org/stc/SA4999NM): Installation of lifeport patient loading and support system. LifePort LLC - [STC SA01213CH](https://openairdocs.org/stc/SA01213CH): Install air ambulance conversion in accordance with Spectrum Aeromed Inc. Drawings as listed on AML SA01213CH, or later FAA approved revision. Spectrum Aeromed LLC dba Spectrum Aeromed - [STC SA1639GL](https://openairdocs.org/stc/SA1639GL): Install air ambulance conversion. Spectrum Aeromed LLC dba Spectrum Aeromed - [STC ST00790DE](https://openairdocs.org/stc/ST00790DE): Installation of BendixKing CAS 67B Traffic Alert and Collision Avoidance System (TCAS) II Version 7.1. Peregrine - [STC ST02636LA](https://openairdocs.org/stc/ST02636LA): Modification to upgrade the existing XS-950 Mode S Transponder system to add ADS-B Out. Aviation Communication and Surveillance Systems (ACSS) LLC - [STC ST00347BO](https://openairdocs.org/stc/ST00347BO): Modification to upgrade a BendixKing CAS 67A TCAS II system to CAS 67B TCAS II Change 7.1. Pro Star Aviation, LLC - [STC ST00373BO](https://openairdocs.org/stc/ST00373BO): Installation of Rockwell Collins TDR-94D Transponders with ADS-B Out. Pro Star Aviation, LLC - [STC ST00226BO](https://openairdocs.org/stc/ST00226BO): Installation of Honeywell CAS-67A Airborne Collision Avoidance System (ACAS II) with dual MST-67A Mode S Transponders and copilot's Intercontinental Dynamics Corporation encoding altimeter with Static Defect Correction Module. Pro Star Aviation, LLC - [STC ST11071SC](https://openairdocs.org/stc/ST11071SC): Demonstration of aircraft critical equipment and antenna systems tolerance of radio frequency interference (RFI) from intentional or spurious transmissions from certain Portable Electronic Devices (PEDs). Liberty Partners Inc - [STC ST02632LA](https://openairdocs.org/stc/ST02632LA): Modification to replace the existing Mode S Transponder system with ACSS NXT-700 Mode S Transponder with ADS-B Out and optionally install ACSS NXG-900 GPS as a position source for ADS-B Out. Aviation Communications and Surveillance Systems - [STC ST02609LA](https://openairdocs.org/stc/ST02609LA): Modification to replace the existing Mode S Transponder system with ACSS NXT-700 Mode S Transponder with ADS-B Out. Aviation Communication and Surveillance Systems (ACSS) LLC - [STC ST03776NY](https://openairdocs.org/stc/ST03776NY): Modification to upgrade existing Rockwell Collins TCAS (Model: TTR-920, TTR-921, and TTR-4000) at VERSION 7.0 to Rockwell Collins TCAS (Model: TTR-921, TTR-4000, and TTR-4100) at VERSION 7.1 (ACAS II). Scandinavian Avionics Design ApS - [STC ST02500SE](https://openairdocs.org/stc/ST02500SE): The installation of the Garmin GDL-88 with the Flight Stream 210 to allow ADS-B(In) Flight Information Service Broadcast (FIS-B), independent of the ADS-B(Out) solution compliance. Butler National Corporation - [STC SA1170GL](https://openairdocs.org/stc/SA1170GL): Except Model 55: Install Egan Aviation air ambulance stretcher P/N 125 using installation kit P/N 803, inverter/pump kit No. 808, 809, or 810. For Model 55, install air ambulance stretcher P/N 125 using installation kit P/N 804, medical oxygen system kit P/N 807, inverter/pump kit No. 808, 809, or810. Paul/ Lanna Egan LLC - [STC ST02583LA](https://openairdocs.org/stc/ST02583LA): Modification of the Engine Exhaust system that installs the Alloy Aerospace, Inc. hush kit on Learjet 20 series aircraft. Alloy Aerospace Inc - [STC ST02121CH](https://openairdocs.org/stc/ST02121CH): Certification for Reduced Vertical Separation Minimum (RVSM) operational capability and installation of dual Honeywell AM-250 Altimeters and Rosemount model 0856NA Pitot-Static Probes. Flight Test Aerospace, Inc - [STC ST01733WI](https://openairdocs.org/stc/ST01733WI): Installation of the Quiet Lear Hushkit or Avcon Noise Suppressor. Butler National Corporation - [STC ST04238AT](https://openairdocs.org/stc/ST04238AT): Upgrade of Honeywell Traffic Collision Avoidance Systems II (TCAS II) Processor Software from TCAS II Version 7.0 to TCAS II Version 7.1. Aviation Partners Group Inc - [STC ST01783WI](https://openairdocs.org/stc/ST01783WI): Installation of Internal Wing Hardpoints. Avcon Industries Inc - [STC ST02316LA](https://openairdocs.org/stc/ST02316LA): Installation of a Crane Aerospace & Electronics Tire Sensor Assembly. ELDEC Corporation - [STC ST01734WI](https://openairdocs.org/stc/ST01734WI): Installation of an Emergency Pneumatic Reservoir Assembly, EAS P/N 1260001-02. EAS Corporation All 100: https://openairdocs.org/model/gates-learjet-25d/stcs.md ## The same model under other registry codes Amateur-built copies and renamed makers get their own codes. - [Learjet 25D](https://openairdocs.org/model/learjet-25d): 1 registered aircraft, registry code 5170515 --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.