# Raytheon DH 125-400A - Type: Aircraft model (FAA registry) - Registry code: 7150050 - Manufacturer (registry): RAYTHEON AIRCRAFT COMPANY - Model: DH 125-400A - Aircraft type: Fixed wing multi engine - Category: Airplane - Engines: 2 · Turbo-jet - Seats: 10 - Weight class: 20,000 lb and over - Certification: Type certificated - Data sheet: [TCDS A3EU](https://openairdocs.org/tcds/A3EU) (OpenAirDocs) - Holder: Textron Aviation Inc. - Registered aircraft: 0 - Page: https://openairdocs.org/model/raytheon-dh-125-400a 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 2026-13-02](https://openairdocs.org/ad/2026-13-02): Navigation · Airbus Canada Limited Partnership 18, 49-46, 80-A and 555 more. Effective Jul 1, 2026 - [AD 2023-10-02](https://openairdocs.org/ad/2023-10-02): Indicating/Recording System, Navigation · Boeing 18, 23, 35 and 1,060 more. Effective May 26, 2023 - [AD 2011-01-09](https://openairdocs.org/ad/2011-01-09): Oxygen · Airbus A300 B2-1A, A300 B2-1C, A300 B2-203 and 290 more. Effective Feb 9, 2011 - [AD 2006-01-04](https://openairdocs.org/ad/2006-01-04): Fan venturi motor casing · Textron BAe.125 Series 1000A, BAe.125 Series 1000B, BAe.125 Series 800A and 42 more. Effective Feb 22, 2006 - [AD 2005-03-16](https://openairdocs.org/ad/2005-03-16): Engine compartment firewall · Textron BAe.125 Series 800A, BAe.125 Series 800A (C-29A), BAe.125 Series 800A (U-125) and 40 more. Effective Mar 21, 2005 - [AD 2003-07-07](https://openairdocs.org/ad/2003-07-07): Tie-bolt Nuts of Main Landing Gear (MLG) Wheels · Textron BAe.125 Series 800A, BAe.125 Series 800A (C-29A), BAe.125 Series 800A (U-125) and 31 more. Effective May 8, 2003 - [AD 2003-04-20](https://openairdocs.org/ad/2003-04-20): Cylinder Head Lugs of Main Landing Gear (MLG) Actuator · Textron BAe.125 Series 1000A, BAe.125 Series 1000B, BAe.125 Series 800A and 43 more. Effective Apr 4, 2003 - [AD 2000-22-03](https://openairdocs.org/ad/2000-22-03): Pitot/Static and Stall Vent Drain Valves · Textron BAe.125 Series 1000A, BAe.125 Series 1000B, BAe.125 Series 800A and 43 more. Effective Dec 4, 2000 - [AD 2000-21-11](https://openairdocs.org/ad/2000-21-11): Cockpit Canopy Blister Interface · Textron BH.125 Series 400A, BH.125 Series 600A, DH.125 Series 1A and 33 more. Effective Nov 29, 2000 - [AD 2000-02-35](https://openairdocs.org/ad/2000-02-35): Oxygen System Plumbing · Textron BAe.125 Series 1000A, BAe.125 Series 1000B, BAe.125 Series 800A and 36 more. Effective Mar 13, 2000 - [AD 89-18-07 R1](https://openairdocs.org/ad/89-18-07-R1): Elevator Balance Spigot · Textron BAe.125 Series 1000A, BAe.125 Series 1000B, BAe.125 Series 800A and 34 more. Effective Dec 18, 1998 - [AD 97-21-05](https://openairdocs.org/ad/97-21-05): High Pressure Oxygen Hose Assemblies · Textron BAe.125 Series 800A, BAe.125 Series 800A (C-29A), BAe.125 Series 800A (U-125) and 8 more. Effective Nov 24, 1997 - [AD 97-03-07](https://openairdocs.org/ad/97-03-07): Main Landing Gear Sidestay Assemblies · Textron BAe.125 Series 1000A, BAe.125 Series 1000B, BAe.125 Series 800A and 42 more. Effective Mar 11, 1997 - [AD 95-08-06](https://openairdocs.org/ad/95-08-06): Static Inverter · Textron BAe.125 Series 800A, BH.125 Series 400A, BH.125 Series 600A and 29 more. Effective May 18, 1995 - [AD 93-24-08](https://openairdocs.org/ad/93-24-08): Engine Fire Extinguisher Systems · Textron BAe.125 Series 1000B, BAe.125 Series 800A, BAe.125 Series 800A (C-29A) and 38 more. Effective Jan 18, 1994 - [AD 93-23-08](https://openairdocs.org/ad/93-23-08): Battery and Emergency Contactors · Textron BAe.125 Series 1000B, BAe.125 Series 800A, BAe.125 Series 800A (C-29A) and 38 more. Effective Dec 29, 1993 - [AD 93-02-10](https://openairdocs.org/ad/93-02-10): Battery Cables · Textron BAe.125 Series 1000A, BAe.125 Series 1000B, BAe.125 Series 800A and 39 more. Effective Mar 26, 1993 - [AD 93-01-10](https://openairdocs.org/ad/93-01-10): Battery Overheating · Textron BAe.125 Series 1000A, BAe.125 Series 1000B, BAe.125 Series 800A and 37 more. Effective Mar 2, 1993 - [AD 92-27-09](https://openairdocs.org/ad/92-27-09): Mail Landing Gear Sidestay Upper Arm Assembly · Textron BAe.125 Series 1000B, BAe.125 Series 800A, BAe.125 Series 800A (C-29A) and 38 more. Effective Jan 27, 1993 - [AD 92-25-11](https://openairdocs.org/ad/92-25-11): Hydraulic Accumulator · Textron BAe.125 Series 1000B, BAe.125 Series 800A, BAe.125 Series 800A (C-29A) and 38 more. Effective Jan 12, 1993 - [AD 92-22-04](https://openairdocs.org/ad/92-22-04): In-Flight Fire Hazard · Textron BH.125 Series 400A, DH.125 Series 1A, DH.125 Series 1A-522 and 6 more. Effective Nov 24, 1992 - [AD 92-20-03](https://openairdocs.org/ad/92-20-03): Main Landing Gear · Textron DH.125 Series 1A, DH.125 Series 1A-522, DH.125 Series 1A/R-522 and 7 more. Effective Nov 17, 1992 - [AD 92-16-12 R1](https://openairdocs.org/ad/92-16-12-R1): Tail Cone Vents · Textron BAe.125 Series 1000B, BAe.125 Series 800A, BAe.125 Series 800A (C-29A) and 38 more. Effective Sep 28, 1992 - [AD 92-11-03](https://openairdocs.org/ad/92-11-03): Eddy Current Inspection · Textron BH.125 Series 400A, DH.125 Series 1A, DH.125 Series 1A-522 and 6 more. Effective Jul 9, 1992 - [AD 92-10-04](https://openairdocs.org/ad/92-10-04): Wing Skin Corrosion · Textron BH.125 Series 400A, BH.125 Series 600A, DH.125 Series 1A and 8 more. Effective Jun 11, 1992 - [AD 92-06-05 R1](https://openairdocs.org/ad/92-06-05-R1): Nose Landing Gear · Textron BAe.125 Series 1000B, BAe.125 Series 800A, BAe.125 Series 800A (C-29A) and 38 more. Effective Apr 21, 1992 - [AD 91-19-05](https://openairdocs.org/ad/91-19-05): Fire Extinguisher System Wiring · Textron BAe.125 Series 800A, BH.125 Series 400A, BH.125 Series 600A and 34 more. Effective Sep 26, 1991 - [AD 91-07-12](https://openairdocs.org/ad/91-07-12): Main Landing Gear Hinge Fittings · BH.125 Series 400A, BH.125 Series 600A, DH.125 Series 1A and 9 more. Effective Apr 29, 1991 - [AD 91-03-18](https://openairdocs.org/ad/91-03-18): Warming Ovens · Textron BAe.125 Series 1000A, BAe.125 Series 1000B, BAe.125 Series 800A and 39 more. Effective Mar 11, 1991 - [AD 91-03-06](https://openairdocs.org/ad/91-03-06): Generator Control Unit · Textron BAe.125 Series 800A, BAe.125 Series 800A (C-29A), BAe.125 Series 800A (U-125) and 36 more. Effective Feb 11, 1991 - [AD 90-03-06](https://openairdocs.org/ad/90-03-06): Corrosion Inspection · Textron BAe.125 Series 1000A, BAe.125 Series 1000B, BAe.125 Series 800A and 39 more. Effective Feb 20, 1990 - [AD 89-18-13](https://openairdocs.org/ad/89-18-13): AFM Changes - APU · Textron BAe.125 Series 1000A, BAe.125 Series 1000B, BAe.125 Series 800A and 39 more. Effective Sep 28, 1989 - [AD 89-17-06](https://openairdocs.org/ad/89-17-06): Electrical Components · Textron BAe.125 Series 1000A, BAe.125 Series 1000B, BAe.125 Series 800A and 39 more. Effective Sep 15, 1989 - [AD 88-05-02](https://openairdocs.org/ad/88-05-02): Airplane Structure · BH.125 Series 400A, BH.125 Series 600A, DH.125 Series 1A and 9 more. Effective Apr 6, 1988 - [AD 87-04-14](https://openairdocs.org/ad/87-04-14): Starter/Generator · BH.125 Series 400A, BH.125 Series 600A, DH.125 Series 1A and 9 more. Effective Mar 9, 1987 - [AD 86-21-05](https://openairdocs.org/ad/86-21-05): Forward Engine Mounts · BH.125 Series 400A, BH.125 Series 600A, DH.125 Series 1A and 9 more. Effective Oct 20, 1986 - [AD 82-12-02 R1](https://openairdocs.org/ad/82-12-02-R1): Flap Structure · BH.125 Series 400A, BH.125 Series 600A, DH.125 Series 1A and 9 more. Effective Jun 17, 1985 - [AD 85-07-08](https://openairdocs.org/ad/85-07-08): Audio Communication System · BH.125 Series 400A, BH.125 Series 600A, DH.125 Series 1A and 9 more. Effective May 13, 1985 - [AD 84-21-01 R1](https://openairdocs.org/ad/84-21-01-R1): Replacement Fuses - ZL Panel · BH.125 Series 400A, BH.125 Series 600A, DH.125 Series 1A and 9 more. Effective Feb 11, 1985 - [AD 84-20-05](https://openairdocs.org/ad/84-20-05): Landing Gear and Brakes · BH.125 Series 400A, BH.125 Series 600A, DH.125 Series 1A and 9 more. Effective Oct 14, 1984 - [AD 77-13-09 R1](https://openairdocs.org/ad/77-13-09-R1): Structural Integrity of Bulkhead · Textron BH.125 Series 400A, BH.125 Series 600A, DH.125 Series 1A and 7 more. Effective Jun 1, 1984 - [AD 80-12-05 R2](https://openairdocs.org/ad/80-12-05-R2): Nose Landing Gear Drag Stay Assembly · BH.125 Series 400A, BH.125 Series 600A, DH.125 Series 1A and 9 more. Effective Mar 16, 1983 - [AD 80-12-10 R1](https://openairdocs.org/ad/80-12-10-R1): Flap Fittings · BH.125 Series 400A, BH.125 Series 600A, DH.125 Series 1A and 9 more. Effective Jan 3, 1983 - [AD 82-18-09](https://openairdocs.org/ad/82-18-09): Refueling System · Single point pressure fueling system (Rogerson ATS STC SA1851WE or 4 others). Effective Oct 4, 1982 - [AD 82-12-03](https://openairdocs.org/ad/82-12-03): Ampere Airfuse Installation · Textron BH.125 Series 400A, BH.125 Series 600A, DH.125 Series 1A and 8 more. Effective Jun 8, 1982 - [AD 82-12-01](https://openairdocs.org/ad/82-12-01): Main Landing Gear Restrictor Valves · BH.125 Series 400A, BH.125 Series 600A, DH.125 Series 1A and 9 more. Effective Jun 8, 1982 - [AD 81-06-06](https://openairdocs.org/ad/81-06-06): Fuel Feed Lines · Garrett AiResearch TFE-731-3-1H engines (AlliedSignal Aviation Services STC SA3870WE). Effective Mar 26, 1981 - [AD 80-12-13](https://openairdocs.org/ad/80-12-13): Engine Mount Beam · BH.125 Series 400A, BH.125 Series 600A, DH.125 Series 1A and 9 more. Effective Jul 14, 1980 - [AD 73-13-10 R2](https://openairdocs.org/ad/73-13-10-R2): Outer Flap Hinge Fittings · Textron BH.125 Series 400A, BH.125 Series 600A, DH.125 Series 1A and 7 more. Effective Jun 23, 1980 - [AD 80-05-02](https://openairdocs.org/ad/80-05-02): Safety Belt Assemblies · Gulfstream Aerospace G-1159, G-1159A, G-1159B and 17 more. Effective Feb 27, 1980 Historical (superseded or no longer in force): - [AD 97-09-12](https://openairdocs.org/ad/97-09-12) (historical): Upper Fuselage Skin · Hawker Beechcraft DH.125 Series 1A, DH.125 Series 1A-522, DH.125 Series 1A/R-522 and 5 more. Effective Jun 6, 1997 All 68: https://openairdocs.org/model/raytheon-dh-125-400a/ads.md ## Information bulletins (advisory) (1) - [SAIB NM-15-24](https://openairdocs.org/saib/NM-15-24): Landing Gear. Issued Sep 29, 2015 ## Registered aircraft None registered with this model now. ## NTSB investigations None matched to aircraft with this model. ## FAA accident and incident reports None matched to aircraft with this model. ## Service difficulty reports (8) As reported by operators and repair stations, by the model named in the report. - [SDR CA040924002](https://openairdocs.org/sdr/CA040924002), Sep 8, 2004: LEVER. CORRODED. (CAN) AFTER AIRCRAFT STRIPPED AND BEFORE PAINT, THIS INCIDENT OCCURRED. WHEN SELECTING FLAPS TO DUMP MODE WE FOUND THE FLAPS WOULD NOT MOVE AT ALL. INVESTIGATIO - [SDR R142003F00001](https://openairdocs.org/sdr/R142003F00001), Jan 13, 2003: STRUCTURE. FAILED. LEFT FLAP FAILURE 41 INCHES OUTBOARD OF INBOARD END. FLAP WAS IAW HS 125 MSB 27-112-2426, MOD 252426 WHICH STRENGTHENS FLAP FOR LANDING IN HEAVY WATER/ SLUSH CO - [SDR R142003F00000](https://openairdocs.org/sdr/R142003F00000), Jan 13, 2003: STRUCTURE. FAILED. LT FLAP FAILURE 41 INCHES OUTBOARD OF INBOARD END. FLAP WAS IAW SB. WHICH STRENGTHENS FLAP FOR LANDING IN HEAVY WATER/ SLUSH CONDITIONS. AIRCRAFT ARRIVED WITH H - [SDR 99ZZZX3682](https://openairdocs.org/sdr/99ZZZX3682), Sep 2, 1999: TURBINE ROTOR. WORN. AT DISASSEMBLY FOR MAJOR PERIODIC INSPECTION. NOTED RUB ON FORWARD FACE OF LPT ROTOR IN ONE AREA OF THE ROOT SURFACE. FOUND 3RD STAGE LPT SEAL CAUSE OF RUB. ALL - [SDR 99ZZZX661](https://openairdocs.org/sdr/99ZZZX661), Nov 2, 1998: FUEL TANK. CHAFED. UPON INSPECTION OF VENTRAL TANK AFTER REMOVAL FOR AIRCRAFT, SEVERAL AREAS OF SIDEWALLS WERE FOUND SCORED AND CHAFED IN RADIUS. SAID AREAS APPEAR TO HAVE BEEN SC - [SDR 99ZZZX709](https://openairdocs.org/sdr/99ZZZX709), Aug 13, 1998: COUPLER. FAILED. HOSE COUPLER, PN BA1723-300, ON THE DUCT ASSY, SILENCER ASSY CAME OFF ONE SIDE CAUSING COMPLETE LOSS OF PRESSURZATION. RE-INSTALLED PER MM. REMOVED AND REPLACED - [SDR 98ZZZX89](https://openairdocs.org/sdr/98ZZZX89), Nov 18, 1997: DAMPER RING. FAILED. WHILE CRUSING AT 26,000 FEET, PILOT OBSERVED AN INCREASE IN OIL PRESSURE FOLLOWED BY A DROP IN PRESSURE. AS OIL PRESSURE CONTINUED TO DECREASE TO 25 PSI, THE PI - [SDR 96ZZZX5735](https://openairdocs.org/sdr/96ZZZX5735), Nov 6, 1996: BALLAST. FAILED. DURING PRE-FLIGHT INSPECTION, CABIN FILLED WITH SMOKE. BALLAST CASE WAS CRACKED AND MATERIAL RUNNING OUT. SUBMITTER SUGGESTS DISABLING THE INTERIOR LIGHTING SYS ## STCs that may be installed (OpenAirDocs) (126, 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 ST12461IB](https://openairdocs.org/stc/ST12461IB): Installation of Cockpit Voice Recorder with optional RIPS Upgrade. Mid- Canada Mod Center - [STC ST03885AT](https://openairdocs.org/stc/ST03885AT): Installation of an Avionica, Inc. avCM Cellular Module. Aircraft Systems and Manufacturing Inc - [STC ST316CH](https://openairdocs.org/stc/ST316CH): Installation of a TCAS791/791A Traffic alert and collision avoidance system I (TCAS I). Acron Aviation Inc - [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 ST11285DS](https://openairdocs.org/stc/ST11285DS): An update to the existing Collins Aerospace Integrated Flight Information System (IFIS) FSU-5010 and upgrade the existing XMWR-1000 to a XMWR-1000S (Sirius XM) in Part 25. BHE & Associates Ltd - [STC ST01930LA](https://openairdocs.org/stc/ST01930LA): Installation of Sandel Avionics SN4500 Electronic Horizontal Situation Indicator (EHSI). Sandel Avionics LLC - [STC ST01084WI](https://openairdocs.org/stc/ST01084WI): Installation of Collins TCAS-4000 TCAS II System (with or without optional Avidyne Flight Max 800 MDF). Blackhawk Aerospace Technologies Inc - [STC ST01085WI](https://openairdocs.org/stc/ST01085WI): Installation of Honeywell MK VIII Enhanced Ground Proximity Warning System (EGPWS) (with/without optional Avidyne Flight Max 800 MFD). Blackhawk Aerospace Technologies Inc - [STC ST04177AT](https://openairdocs.org/stc/ST04177AT): Installation of a Talon Aerospace LED Replacement General Purpose Lamps. Aaxico Technical Services 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 ST02068CH](https://openairdocs.org/stc/ST02068CH): Install air ambulance conversion. Spectrum Aeromed LLC dba Spectrum Aeromed - [STC ST00373BO](https://openairdocs.org/stc/ST00373BO): Installation of Rockwell Collins TDR-94D Transponders with ADS-B Out. Pro Star Aviation, LLC - [STC SA2728SW](https://openairdocs.org/stc/SA2728SW): Installation of Global GNS-500A Omega/VLF System for Secondary Navigation. Associated Air Center, Inc. - c/o CT Corporation System - [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 ST00304WI](https://openairdocs.org/stc/ST00304WI): Installation of Keddeg Company 21BC113 coaleser assembly. Purolator Facet, Inc - [STC ST01228WI](https://openairdocs.org/stc/ST01228WI): Replacement of OEM window pane assemblies with Lee Aerospace laminated window assembly and termination of OEM dry air system. Lee Aerospace, 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 ST00780WI-D](https://openairdocs.org/stc/ST00780WI-D): Modification of Collins VHF-22A/VHF-22B VHF COMM Receiver Transmitter with CTL-22 Control Pro Line II System Installation to a Collins VHF-22C/VHF-22D VHF COMM Receiver Transmitter with CTL-22C Control 8.33 kHz Pro Line II System Installation. Textron Aviation Inc - [STC ST00781WI-D](https://openairdocs.org/stc/ST00781WI-D): Modification of Collins VHF-20/VHF-20A/VHF-20B VHF COMM Receiver Transmitter with CTL-20 Control Pro Line I System Installation to a Collins VHF-22C/VHF-22D VHF COMM Receiver Transmitter with CTL-22C Control 8.33 kHz Pro Line II System Installation. Textron Aviation Inc - [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 SA1002CE](https://openairdocs.org/stc/SA1002CE): Relocation of warning cancel switch from instrument panel to #1 engine power lever. Textron Aviation Inc - [STC ST01560CH](https://openairdocs.org/stc/ST01560CH): Install Aero Medical Products Mfg., Inc. Air Ambulance Stretcher P/N 125 using Installation Kit P/N 805. Paul/ Lanna Egan LLC - [STC ST01809LA](https://openairdocs.org/stc/ST01809LA): Installation of Hawker PN 9750W0640 Sealed Lead Acid Battery. Securaplane Technologies - [STC ST01675WI](https://openairdocs.org/stc/ST01675WI): Modification of a Rockwell Collins, Inc. File Server Unit (FSU) installation. Rockwell Collins Inc - [STC ST546CH-D](https://openairdocs.org/stc/ST546CH-D): Installation of an AlliedSignal Avionics, Dual GNS-XLS, Flight Management System with GPS as a primary means of navigation. Standard Aero - [STC SA2404WE](https://openairdocs.org/stc/SA2404WE): Consolidation of STC s SA355CE and SA362CE into one STC having a Master Eligibility List and amendment of these STC s to include and improved Power Supply Assembly and Subchassis Timer Assembly for the Twilighter MK III high intensity supplementary lighting system in accordance with the applicable FAA sealed drawing listed on the attached sealed Master Eligibility List Number SA2404WE. BF Goodrich Aerospace - [STC SA355CE](https://openairdocs.org/stc/SA355CE): : Installation of Hoskins Twilighter MK/III B High Intensity Lighting System. BF Goodrich Aerospace - [STC ST01380LA](https://openairdocs.org/stc/ST01380LA): Installation of Diamond J, Inc. Engine Indicators N1, N2, and ITT. Gulfstream-California Inc - [STC ST00673WI-D](https://openairdocs.org/stc/ST00673WI-D): Modification of Collins VHF-22A/VHF-22B VHF COMM Receiver Transmitter with CTL-22 Control Pro Line II System Installation to a Collins VHF-22C/VHF-22D VHF COMM Receiver Transmitter with CTL-22C Control 8.33 kHz Pro Line II System installation. Rockwell Collins Inc - [STC ST00682WI-D](https://openairdocs.org/stc/ST00682WI-D): Modification of Collins VHF-20/VHF-20A/VHF-20B VHF COMM Receiver Transmitter with CTL-20 Control Pro Line I System Installation to a Collins VHF-22C/VHF-22D VHF COMM Receiver Transmitter with CTL-22C Control 8.33 kHz Pro Line II System Installation in accordance with Collins Installation Instructions as listed on AML No. ST00682WI-D, Revision -, or later FAA approved revisions. Rockwell Collins Inc - [STC ST01486SE-D](https://openairdocs.org/stc/ST01486SE-D): Group aircraft approval for Reduced Vertical Separation Minimum (RVSM). AeroMech Incorporated - [STC ST349CH-D](https://openairdocs.org/stc/ST349CH-D): Installation of APU Access Panels. Standard Aero - [STC ST01623SE](https://openairdocs.org/stc/ST01623SE): Installation of Innovative Solutions and Support (IS&S) Air Data Display Units. AeroMech Incorporated - [STC ST01003CH-D](https://openairdocs.org/stc/ST01003CH-D): Installation of AlliedSignal Aerospace N1 digital electronic engine control (DEEC). Honeywell International Inc - [STC ST01514CH-D](https://openairdocs.org/stc/ST01514CH-D): Installation of Universal Avionics Systems Corporation Terrain Awareness Warning System (TAWS), Software Control (SCN) 10.X and Universal Multi-Function Display (MFD). Duncan Aviation Inc - [STC ST456CH-D](https://openairdocs.org/stc/ST456CH-D): Installation of AlliedSignal Aerospace TFE731-3D-1H or TFE731-3DR-1H Turbofan Engine(s). Honeywell International Inc - [STC SA180NE](https://openairdocs.org/stc/SA180NE): Installation of Teledyne Avionics normalized angle of attack indicating system P/N 112B5700. Aerosonic Corporation - [STC SA844EA](https://openairdocs.org/stc/SA844EA): Installation of Teledyne Avionics Angle of Attack System SL112B300. Aerosonic Corporation - [STC SA866EA](https://openairdocs.org/stc/SA866EA): Installation of Grimes three light strobe kit. Honeywell International Inc - [STC ST01142WI-D](https://openairdocs.org/stc/ST01142WI-D): Modification of a single or dual Collins TDR-94 or TDR-94D Mode S Transponder System installation with CTL-92 control head to a Flight ID capable Collins TDR-94 or TDR-94D Mode S Transponder System installation with CTL-92E control head. Rockwell Collins Inc - [STC SA786EA](https://openairdocs.org/stc/SA786EA): Installation of lavatory door and bulkhead at station 392. Garrett Aviation Services - [STC ST02171CH](https://openairdocs.org/stc/ST02171CH): Installation of dual Innovative Solutions and Support Air Data Display Uits and dual Analog Interface Units. Envoy Aerospace LLC - [STC ST01307WI-D](https://openairdocs.org/stc/ST01307WI-D): Modification of a Collins TVI-920/TVI-920D Vertical Speed/TCAS Indicator installation. Rockwell Collins Inc - [STC ST01505SE](https://openairdocs.org/stc/ST01505SE): Descriptive data pertaining to this design change are considered inadequate for duplication on other products. This approval is limited to Hawker Siddeley DH.125 Series 400A, Serial Number NA742 only. Non-Group (Individual) aircraft approval for Reduced Vertical Separation Minimum (RVSM). AeroMech Incorporated - [STC SA4624SW](https://openairdocs.org/stc/SA4624SW): Replace existing N1, N2 and ITT indicators with Howell autotak and autotemp indicators. Howell Instruments Inc - [STC ST01946NY](https://openairdocs.org/stc/ST01946NY): Cockpit voice recorder replacement with Universal CVR 30B or CVR120. MidCanada Mod Center - [STC SA674CE](https://openairdocs.org/stc/SA674CE): Installation of Solar T-62T-39Y, -39 or -40C APU modifications. PATS Aircraft LLC - [STC SA1173EA](https://openairdocs.org/stc/SA1173EA): Rework of Solar T-62T-39 APU installed by STC SA674CE when Garrett AiResearch TFE-731-3-1H engines are installed per STC SA3870WE. PATS Aircraft LLC All 126: https://openairdocs.org/model/raytheon-dh-125-400a/stcs.md ## The same model under other registry codes Amateur-built copies and renamed makers get their own codes. - [British Aerospace DH.125-400A](https://openairdocs.org/model/british-aerospace-dh-125-400a): 0 registered aircraft, registry code 1500102 - [Hawker Siddeley DH.125-400A](https://openairdocs.org/model/hawker-siddeley-dh-125-400a): 0 registered aircraft, registry code 4230140 --- 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.