# Rogerson Hiller UH-12E

- Type: Aircraft model (FAA registry)
- Registry code: 4366001
- Manufacturer (registry): ROGERSON HILLER CORP
- Model: UH-12E
- Aircraft type: Rotorcraft
- Category: Rotorcraft
- Engines: 1 · Reciprocating
- Seats: 3
- Weight class: Up to 12,499 lb
- Certification: Type certificated
- Data sheet: [TCDS 4H11](https://openairdocs.org/tcds/4H11) (OpenAirDocs)
- Holder: Siam Hiller Holdings Inc.
- Registered aircraft: 0
- Page: https://openairdocs.org/model/rogerson-hiller-uh-12e

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 2025-15-02](https://openairdocs.org/ad/2025-15-02): Main Rotor Mast/Swashplate · Siam Hiller Holdings UH-12E and UH-12E-L. Effective Sep 24, 2025
- [AD 2023-11-07](https://openairdocs.org/ad/2023-11-07): Ground Proximity System · Airbus Helicopters 47, 206, 210 and 237 more. Effective Jun 22, 2023
- [AD 2015-20-51](https://openairdocs.org/ad/2015-20-51): Hiller UH-12, UH-12A, UH-12B and 6 more
- [AD 2000-24-21](https://openairdocs.org/ad/2000-24-21): Control System Linkage · Hiller UH-12, UH-12A, UH-12B and 6 more. Effective Jan 10, 2001
- [AD 97-20-15](https://openairdocs.org/ad/97-20-15): Outboard Tension-Torsion Bar Pin · Hiller UH-12A, UH-12B, UH-12C and 2 more. Effective Nov 12, 1997
- [AD 97-10-16](https://openairdocs.org/ad/97-10-16): Blade Spar Tube and Cuff Inspection · Allison 250-C20/250-C20B engine (Siam Hiller Holdings STC SH177WE or SH178WE). Effective Jun 27, 1997
- [AD 90-15-01](https://openairdocs.org/ad/90-15-01): Tail Rotor Blade Assemblies · Hiller UH-12L, UH-12L4, UH-12E and 1 more. Effective Mar 7, 1991
- [AD 86-22-04](https://openairdocs.org/ad/86-22-04): Main Rotor Blades · Hiller UH-12D, UH-12E and UH-12E-L with STC SH177WE or SH178WE. Effective Nov 3, 1986
- [AD 86-17-02](https://openairdocs.org/ad/86-17-02): Main Rotor Blade Fork · Hiller UH-12D, UH-12E and UH-12E-L with STC SH177WE or SH178WE. Effective Aug 22, 1986
- [AD 84-19-08](https://openairdocs.org/ad/84-19-08): Engine Mount · Hiller UH-12D, UH-12E and UH-12E-L with STC SH177WE or SH178WE. Effective Sep 20, 1984
- [AD 83-25-02](https://openairdocs.org/ad/83-25-02): Main Rotor Blade Doublers · Allison 250-C20/250-C20B engine (Siam Hiller Holdings STC SH177WE). Effective Dec 29, 1983
- [AD 82-16-07](https://openairdocs.org/ad/82-16-07): Torsional Coupling Assemblies · Hiller UH-12L, UH-12L4, UH-12E and 1 more. Effective Oct 15, 1982
- [AD 82-13-04 R1](https://openairdocs.org/ad/82-13-04-R1): Torsional Couplings · Hiller UH-12L, UH-12L4, UH-12E and 1 more. Effective Sep 13, 1982
- [AD 82-15-02](https://openairdocs.org/ad/82-15-02): Main And Tail Rotors · Hiller UH-12D, UH-12L, UH-12L4 and 2 more. Effective Jul 16, 1982
- [AD 81-18-02](https://openairdocs.org/ad/81-18-02): Tail Rotor Skin Cracks · Hiller UH-12, UH-12A, UH-12B and 6 more. Effective Sep 10, 1981
- [AD 81-17-03](https://openairdocs.org/ad/81-17-03): Main Transmission · Hiller UH-12, UH-12A, UH-12B and 6 more. Effective Aug 24, 1981
- [AD 81-09-08](https://openairdocs.org/ad/81-09-08): Main Rotor Blade · Hiller UH-12D and UH-12E with STC SH177WE or SH178WE. Effective Jun 25, 1981
- [AD 81-04-01](https://openairdocs.org/ad/81-04-01): Rudder Cable Assembly · Hiller UH-12D, UH-12L and UH-12E. Effective Feb 9, 1981
- [AD 80-23-02](https://openairdocs.org/ad/80-23-02): Turbine Power Conversions · Allison 250-C20/250-C20B engine (Siam Hiller Holdings STC SH177WE or 2 others). Effective Nov 20, 1980
- [AD 80-19-02](https://openairdocs.org/ad/80-19-02): Turbine Power - Soloy Conversions · Hiller UH-12D and UH-12E with STC SH177WE or SH178WE. Effective Oct 11, 1980
- [AD 80-07-04](https://openairdocs.org/ad/80-07-04): Main Rotor Blade Anti-Node Bars · Hiller UH-12, UH-12D and UH-12E. Effective Mar 31, 1980
- [AD 79-03-07](https://openairdocs.org/ad/79-03-07): Main Rotor Tachometer Generator · Hiller UH-12D and UH-12E with STC SH177WE or SH178WE. Effective Feb 21, 1979
- [AD 78-23-07](https://openairdocs.org/ad/78-23-07): Finite Life Components Listed in AD · Hiller UH-12D and UH-12E. Effective Dec 14, 1978
- [AD 78-22-08](https://openairdocs.org/ad/78-22-08): Flight/Engine Control · Hiller UH-12D and UH-12E with STC SH177WE or SH178WE. Effective Nov 30, 1978
- [AD 78-22-02](https://openairdocs.org/ad/78-22-02): Rotor Blade Retention System · Hiller UH-12D and UH-12E. Effective Oct 27, 1978
- [AD 78-18-03](https://openairdocs.org/ad/78-18-03): Drive Shaft · Hiller UH-12D and UH-12E with STC SH177WE or SH178WE. Effective Oct 6, 1978
- [AD 77-24-03](https://openairdocs.org/ad/77-24-03): Fuel Control Valve · Hiller UH-12C, UH-12D, UH-12L and 3 more. Effective Jan 6, 1978
- [AD 75-10-01](https://openairdocs.org/ad/75-10-01): Rotor Drive System · Hiller UH-12D, UH-12L, UH-12L4 and 2 more. Effective May 8, 1975
- [AD 61-05-04](https://openairdocs.org/ad/61-05-04): Main Transmission · Hiller UH-12D and UH-12E. Effective Jun 4, 1974
- [AD 74-04-03](https://openairdocs.org/ad/74-04-03): Main Rotor Drag Struts · Hiller UH-12D and UH-12E. Effective Feb 18, 1974
- [AD 73-20-03](https://openairdocs.org/ad/73-20-03): Main Rotor Hub · Hiller UH-12, UH-12A, UH-12B and 4 more. Effective Oct 30, 1973
- [AD 71-25-08](https://openairdocs.org/ad/71-25-08): Inspect Main Rotor Blades · Hiller UH-12, UH-12A, UH-12B and 6 more. Effective Dec 14, 1971
- [AD 69-13-07](https://openairdocs.org/ad/69-13-07): Collective Yoke Support Brackets · Hiller UH-12D, UH-12L, UH-12L4 and 2 more. Effective Apr 30, 1970
- [AD 69-08-08](https://openairdocs.org/ad/69-08-08): Tail Rotor Yoke · Hiller UH-12D, UH-12L, UH-12L4 and 2 more. Effective Apr 23, 1969
- [AD 67-08-03](https://openairdocs.org/ad/67-08-03): Cyclic Control Bracket · Hiller UH-12D and UH-12E. Effective Mar 9, 1967
- [AD 66-22-04](https://openairdocs.org/ad/66-22-04): Mercury Clutches · Hiller UH-12D, UH-12L, UH-12L4 and 2 more. Effective Sep 2, 1966
- [AD 64-11-02](https://openairdocs.org/ad/64-11-02): Tail Rotor Pinion Gears · Siam Hiller Holdings UH-12E and UH-12E-L. Effective May 16, 1964
- [AD 76-20-06](https://openairdocs.org/ad/76-20-06): Cable Freezing Control · Hiller UH-12D and UH-12E with STC SH177WE or SH178WE
- [AD 63-21-03](https://openairdocs.org/ad/63-21-03): Main Rotor Blades · Hiller UH-12D and UH-12E
- [AD 62-06-03](https://openairdocs.org/ad/62-06-03): Transmission & Lubrication System Modification · Hiller UH-12D and UH-12E
- [AD 59-25-03](https://openairdocs.org/ad/59-25-03): Wobble Plate Screws · Hiller UH-12, UH-12A, UH-12B and 3 more
- [AD 59-05-05](https://openairdocs.org/ad/59-05-05): Cyclic Control Scissor Casting · Hiller UH-12, UH-12A, UH-12B and 3 more

Historical (superseded or no longer in force):

- [AD 2021-23-13](https://openairdocs.org/ad/2021-23-13) (historical): Ground Proximity System · Airbus Helicopters K-225, K-190A, K-240 and 237 more. Effective Dec 9, 2021
- [AD 77-07-05 R1](https://openairdocs.org/ad/77-07-05-R1) (historical): Control Rotor Blade Spar Tube and Cuff · Hiller UH-12, UH-12A, UH-12B and 3 more. Effective Jun 20, 1977
- [AD 77-07-05](https://openairdocs.org/ad/77-07-05) (historical): Control Rotor Blade Spar Tube and Cuff · Hiller UH-12, UH-12A, UH-12B and 3 more. Effective Jun 20, 1977

## 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 (58, newest 50)

As reported by operators and repair stations, by the model named in the report.

- [SDR 2022FA0000286](https://openairdocs.org/sdr/2022FA0000286), Jun 10, 2022: HUB. CRACKED. A CRACK WAS FOUND ON THE OUTSIDE OF M/R HUB ORIGINATING FROM INBOARD TT PIN HOLE. THE CRACK EXTENDS FROM THE INSIDE DIAMETER OF THE BORE TO THE OUTSIDE OF THE H
- [SDR BHHR20190607001](https://openairdocs.org/sdr/BHHR20190607001), Apr 18, 2019: HOUSING. CRACKED. A CRACK WAS FOUND IN TRANSMISSION LOWER HOUSING JUST BELOW THE CYCLIC BELLCRANK BRACKET P/N 33031 MOUNTING FACE. THE CRACK WAS LOCATED IN THE AFT LOWER MOUNTING
- [SDR BHHR201710030002](https://openairdocs.org/sdr/BHHR201710030002), Oct 3, 2017: GEAR. SPALLED. ENGINE WAS REMOVED FROM SERVICE DUE TO CHIP LIGHTS AND AN AUDIBLE WHINE HEARD OVER THE RUNNING AIRCRAFT. THIS GEARBOX WAS ASSEMBLED IN-HOUSE AFTER A 3500 HOUR O
- [SDR BHHR201710030001](https://openairdocs.org/sdr/BHHR201710030001), Oct 3, 2017: DRIVE GEAR. SPALLED. A TEAR-DOWN INSPECTION OF A 250-C20B ENGINE GEARBOX WAS PERFORMED. THIS GEARBOX WAS REMOVED FROM SERVICE DUE TO CHIP LIGHTS AND AN AUDIBLE WHINE HEARD OVER THE 
- [SDR BHHR20170201001](https://openairdocs.org/sdr/BHHR20170201001), Feb 1, 2017: FORK. MISMANUFACTURED. DISCOVERED THE OUTBOARD TENSION TORSION PIN BORES ARE MISALIGNED. DISCOVERED BORES NOT BEING CONCENTRIC BY MANUFACTURING A WORKAID THAT FIT INTO OUTBOARD TT PIN
- [SDR 2015FA0000448](https://openairdocs.org/sdr/2015FA0000448), Sep 11, 2015: FORK. CRACKED. AFTER DETERMINING WHAT MAY HAVE CAUSED SN 11513P TO CRACK, WE CHECKED WHICH WAS UNDERGOING MAINTENANCE. WE FOUND SN 11527P TO HAVE A 1" LONG CRACK IN THE SAME P
- [SDR CA120605011](https://openairdocs.org/sdr/CA120605011), May 29, 2012: CROSSTUBE. BROKEN. (CAN) FWD CROSSTUBE WAS FOUND BROKEN AT THE LT SIDE INBD BOLT HOLE UPON INSPECTION AFTER BEING TRAILERED TO A JOB SITE.
- [SDR CA100824006](https://openairdocs.org/sdr/CA100824006), Aug 24, 2010: PIN. BROKEN. TENSION TORSION PIN BROKE OFF AT MAIN ROTOR HEAD WHERE DRAG BRACE ATTACHES TO PIN. ACFT WAS IN CRUISE FLIGHT PERFORMING AERIAL SPRAY APPLICATION. ACFT STARTED T
- [SDR 2010FA0000071](https://openairdocs.org/sdr/2010FA0000071), Jan 25, 2010: FORK. DAMAGED. FOUND DURING AN INCOMING INSPECTION THE FOLLOWING DEFECTS ON 4EA NEW FAA PMA PARTS SN 11566P/11567P/ 11568P & 11569P AS FOLLOWS; EDGE RADIUS OF ALL FORK BLADE P
- [SDR 2009FA0000332](https://openairdocs.org/sdr/2009FA0000332), Apr 24, 2009: HUB. CRACKED. MAIN ROTOR HUB PN 51437-11 SN 20074 SHOWED SIGNS OF POSSIBLE CRACK DURING PREFLIGHT, PERFORMED DYE PENETRANT INSP, AS PRECAUTIONARY MEASURE, CRACK INDICATION PR
- [SDR CA090220003](https://openairdocs.org/sdr/CA090220003), Feb 20, 2009: SPAR. CRACKED. (CAN) DURING INSP IAW AWD 97-10-16 (A) CONTROL ROTOR PN 36209-3, SN 449. FOUND CRACKED AT LOWER BOLT HOLE .600 FROM END OF SPAR.
- [SDR 2009FA0000580](https://openairdocs.org/sdr/2009FA0000580), Nov 4, 2008: BLADE. SEPARATED. DURING CRUISE FLIGHT, 1 OR 2 CONTROL ROTOR BLADE ASSEMBLIES SEPARATED FROM ROTOR HEAD. ROTOR CONTROL BLADE ASSY TUBE BROKE OTBD OF 2 BOLTS ATTACHING IT TO CUFF 
- [SDR 2008FA0000372](https://openairdocs.org/sdr/2008FA0000372), May 14, 2008: RETAINER. MISMANUFACTURED. RETAINER SUSPECTED LOCALLY MADE INSTALLATION WORD "UP" IS NOT STAMPED ON PART BUT ETCHED ON BY HAND. THICKNESS OF RETAINER IS .045, ACTUAL PART THICKNESS OF NEW
- [SDR CA080314019](https://openairdocs.org/sdr/CA080314019), Mar 4, 2008: BEARING. FAILED. (CAN) CHIP LIGHTS METAL CONTAMINATION ENGINE SHOP DETERMINED NR 5 BEARING FAILURE. (TC NR 20080314019)
- [SDR 2006FA0000900](https://openairdocs.org/sdr/2006FA0000900), Sep 1, 2006: CABLE. BROKEN. LT TAIL ROTOR CABLE FAILED. OPERATOR OPERATES IN VERY DUSTY ENVIRONMENT. BUILD UP OF DUST AND OILY SUBSTANCE FROM PRODUCT FOR SPRAYING CAUSE A FINE ABRASIVE SUB
- [SDR 2006FA0000427](https://openairdocs.org/sdr/2006FA0000427), Apr 12, 2006: HUB. CRACKED. M/R HUB DYE CHECK INSPECTION. HUB WAS FOUND TO BE CRACKED. RETIREMENT LIFE, 2500 HOURS. (K)
- [SDR 2005FA0000824](https://openairdocs.org/sdr/2005FA0000824), Jun 6, 2005: MAST. CRACKED. HELICOPTER EXPERIENCED A PROGRESSIVE LATRIAL VIBRATION. SUBSEQUENT INSPECTION FOUND 2 CRACKS FROM THE PITCH PIN SLOT AREA OF THE MAST. ONE CRACK FROM THE TOP OF
- [SDR AUS20030449](https://openairdocs.org/sdr/AUS20030449), Apr 9, 2003: CONTROL CABLE. FAILED. (AUS) TAIL ROTOR CONTROL CABLE FAILED. CABLE RUNS FROM RT PEDAL TO FIREWALL LOCATED BEHIND THE PILOT SEAT. CABLE HAD BEEN SUBJECTEDTO HEAT SOURCE, POSSIBLY CONT
- [SDR AUS20020789](https://openairdocs.org/sdr/AUS20020789), Jun 14, 2002: SCREW. FAILED. (AUS) ENGINE ACCESSORY DRIVE GEAR PNO 67609 TO STARTER DRIVE GEAR PNO 67583 ATTACHMENT STUDS (6OFF) PNO STD-2208 AND DOWELS (3OFF) PNO72139 SHEARED.
- [SDR AUS20010648](https://openairdocs.org/sdr/AUS20010648), May 31, 2001: GEAR. FAILED. (AUS) ENGINE DRIVE GEAR PNO 67583 HAD SHEARED ALL THE BOLTS ATTACHING IT TO ACCESSORY DRIVE PNO 67609.
- [SDR 20010531CW001](https://openairdocs.org/sdr/20010531CW001), May 7, 2001: BLADE. DELAMINATED. DOUBLER DELAMINATION NO SIGNS OF CORROSION OR IMPACT WHICH MIGHT CAUSE DELAMINATION. CAUSE UNKNOWN
- [SDR AU001151](https://openairdocs.org/sdr/AU001151), Dec 5, 2000: HUB. CRACKED. (AUS) MAIN ROTOR HUB SEVERELY CRACKED IN AN AREA NOT KNOWN FOR CRACKING. FOLLOWING TAKEOFF CONTROL WAS ALMOST IMPOSSIBLE AND THE MASSIVE VIBRATION CAUSED THE FO
- [SDR 20001113SH006](https://openairdocs.org/sdr/20001113SH006), Oct 27, 2000: HUB. CRACKED. PRIOR TO THE INSTALLATION OF MAIN ROTOR HEAD ASSY, SN 493, AD 73-20-03 WAS ACCOMPLISHED. THE MAIN ROTOR HUB, SN 493, WAS FOUND CRACKED INSIDE THE HUB IN THE ARE
- [SDR AU000500](https://openairdocs.org/sdr/AU000500), Jun 21, 2000: CUFF. CRACKED. (AUS) MAIN ROTOR CUFF CRACKED FROM BOLT HOLE. CRACK LENGTH 10MM (0.393IN). FOUND DURING DYE PENETRANT INSPECTION IAW AD/HIL12/17(SB 36-1).
- [SDR 20000601SH010](https://openairdocs.org/sdr/20000601SH010), May 17, 2000: BLADE. DELAMINATED. BLADE WAS RETURNED TO BLADE SHOP FOR REPAIR OF SKIN TO TRAILING EDGE DISBOND. UPON INSPECTION, APPEARS THAT CLEANING AND/OR METAL PREP PROCESS FAILED CAUSING SK
- [SDR 99ZZZX4550](https://openairdocs.org/sdr/99ZZZX4550), Nov 10, 1999: CUFF. FAILED. CONTROL ROTOR CUFF SPLIT IN TWO AT THE INBOARD BOLT HOLE. OUTBOARD SECTION AND CONTROL ROTOR TUBE ASSEMBLY SEPARATED FROM HELICOPTER CAUSING LOSS OF CONTROL. CR
- [SDR CA991103012](https://openairdocs.org/sdr/CA991103012), Sep 21, 1999: OIL PUMP. SEIZED. (CAN) TRANSMISSION OIL PUMP HAD FAILED, FAILING TO LUBRICATE THE LOWER MAIN ROTOR TRANSMISSION RGB CAUSING IT TO SEIZE. TEAR DOWN TO FOLLOW.
- [SDR 99ZZZX211](https://openairdocs.org/sdr/99ZZZX211), Oct 27, 1998: MOUNT. SEPARATED. RUBBER MOUNT SEPARATION FROM MOUNTING FLANGE. RUBBER CURE DATE 11-95, MFG BY LORD. PART HAS BEEN IN SERVICE 12 MONTHS.
- [SDR 98ZZZX3262](https://openairdocs.org/sdr/98ZZZX3262), Jul 10, 1998: TERMINAL. CRACKED. DURING OVERHAUL NDT INSPECTION, FOUND CRACKED TERMINAL BORE. CRACK ABOUT .100 INCH INTO THE BORE AND ACROSS THE CLEVIS FACE. REF: CHI WO C7289. WORKSHEET 7-2-98
- [SDR 98ZZZX3261](https://openairdocs.org/sdr/98ZZZX3261), Jul 10, 1998: HUB. CRACKED. DURING OVERHAUL NDT INSPECTION, FOUND THE 4 CRACKS FROM THE T.T. PIN BORES.
- [SDR CA980507004](https://openairdocs.org/sdr/CA980507004), Apr 25, 1998: DAMPER ARM. FRACTURED. (CAN) A COMPLETE FRACTURE OCCURRED CAUSING THE ARM TO FAIL IN 2 PIECES. THE DAMPER ARM HOLDS A VIBRATION ABSORBING WEIGHT TO A FLIGHT CONTROL. THE FAILURE OF TH
- [SDR AU971422](https://openairdocs.org/sdr/AU971422), Nov 7, 1997: PIN. CRACKED. (AUS) MAIN ROTOR HEAD TENSION/TORSION PIN CRACKED.
- [SDR 97ZZZX3544](https://openairdocs.org/sdr/97ZZZX3544), Jul 19, 1997: BEARING. MISMANUFACTURED. NEW REPLACEMENT BEARING RECEIVED WITH INSTRUCTIONS FROM MRC (BEARING MFG), AND HILLER SL UH12-25-1 DESCRIBING INSTALLATION INSTRUCTIONS WITH REGARDS TO THE FILI
- [SDR AU970991](https://openairdocs.org/sdr/AU970991), Jun 14, 1997: GEAR. DAMAGED. (AUS) MAIN ROTOR TRANSMISSION UPPER PLANETARY RING GEAR TOOTH CHIPPED - MINOR DAMAGE TO ONE UPPER PLANETARY GEAR
- [SDR CA970716002](https://openairdocs.org/sdr/CA970716002), Jun 12, 1997: BOLT. SHEARED. (CAN) ENGINE FAILED IN FLIGHT. ON DISASSEMBLY IT WAS FOUND THAT THE CAMSHAFT GEAR SCREWS HAD SHEARED EXCEPT FOR ONE THAT WAS STILL INTACT, BUT LYING IN THE OIL 
- [SDR CHI1789](https://openairdocs.org/sdr/CHI1789), May 20, 1997: SHAFT SPLINE. CRACKED. UPPER AND LOWER TRANSMISSION COUPLING SPLINE SHAFT HAS ONE SPLINE CRACKED NEAR OUTER END OF SPLINE. REPLACED CRACKED SHAFT WITH SERVICEABLE UNIT. (X)
- [SDR 97ZZZX2037](https://openairdocs.org/sdr/97ZZZX2037), Apr 24, 1997: PISTON PIN. DEFECTIVE. AD 97-01-03 AND LYC SB 527B DO NOT REFERENCE VO540 ENGINES IN MODELS AFFECTED, BUT 4 OF 6 PISTON PINS IN ENGINE HAD TO BE REPLACED IN C/W THE SB REQUIRED ACTION
- [SDR 97ZZZX2838](https://openairdocs.org/sdr/97ZZZX2838), Apr 7, 1997: INTAKE VALVE. WORN. THE VALVE STEM UNDER THE KEEPER'S WAS HEAVILY WORN. THIS CONDITION WAS ALSO FOUND ON 4 OTHER VALVES (INTAKE) ALL HAVING THE SAME TOTAL TIME AND PART NUMBER. THE
- [SDR 97ZZZX1825](https://openairdocs.org/sdr/97ZZZX1825), Apr 7, 1997: VALVE. FAILED. THE HELICOPTER WAS RUNNING ROUGH SO A COMPRESSION CHECK WAS RUN. THE NR 2 CYLINDER HELD NO COMPRESSION AND WAS REMOVED FOR INSPECTION. NOTED A .1250 INCH BY .25
- [SDR 97ZZZX1680](https://openairdocs.org/sdr/97ZZZX1680), Mar 26, 1997: CUFF. CRACKED. IAW AD 77-07-05(S) AND HILLER SB 36-1 REV 3, PARA 2(G). FOUND CRACK AT CONTROL BLADE CUFF INBOARD BOLT HOLE DURING 100-HOUR REPETATIVE DYE-PENETRANT INSPECTION.
- [SDR 97ZZZX1679](https://openairdocs.org/sdr/97ZZZX1679), Mar 26, 1997: CUFF. CRACKED. IAW AD 77-07-05(S) AND HILLER SB 36-1 REV 3, PARA 2(G). FOUND CRACK AT CONTROL BLADE CUFF INBOARD BOLT HOLE DURING 100-HOUR REPETATIVE DYE-PENETRANT INSPECTION.
- [SDR AU970349](https://openairdocs.org/sdr/AU970349), Mar 23, 1997: STUD. BROKEN. (AUS) NO2 CYLINDER HOLD DOWN STUDS BROKEN - INVESTIGATION FOUND SIX CYLINDER BASE NUTS MISSING, THIRTY NUTS LOOSE AND ONLY TWELVE NUTS TO BE TIGHT - CRANKCASE P
- [SDR 97ZZZX1133](https://openairdocs.org/sdr/97ZZZX1133), Feb 25, 1997: CYLINDER. NOT TO SPEC. DURING ASSEMBLY OF ENGINE, MEASURED DRY TAPPET CLEARANCE FROM .107 INCH TO .187 INCH. LYC OHM REQUIRES .028 INCH TO .080 INCH. RETURNED 6 CYLINDERS TO EC/SW WHE
- [SDR 97ZZZX95](https://openairdocs.org/sdr/97ZZZX95), Nov 27, 1996: DRIVESHAFT. CRACKED. DURING POST-FLIGHT INSPECTION, PILOT FOUND 1 INCH CRACKS EMANATING FROM RIVETS THAT ATTACH BALANCE WEIGHTS TO INTERIOR TO DRIVESHAFT. SUBMITTER RECOMMENDS THIS 
- [SDR 96ZZZX5942](https://openairdocs.org/sdr/96ZZZX5942), Nov 13, 1996: HUB. CRACKED. CRACK FOUND INSIDE CONICAL SURFACE DURING PRE-FLIGHT INSPECTION. CRACKING IN THIS AREA IS COMMON.
- [SDR 96ZZZX5941](https://openairdocs.org/sdr/96ZZZX5941), Nov 9, 1996: BOLT. FAILED. IN CLIMB-OUT FROM LOG LANDING WITH EXT LOAD AT AN ALT OF APPROX 400 FEET AND 69.5 PSI TORQ, PILOT HEARD A 'BANG' FOLLOWED BY A HIGH FREQ VIBR. AFTER CHECKING AL
- [SDR 96ZZZX5940](https://openairdocs.org/sdr/96ZZZX5940), Nov 9, 1996: BOLT. FAILED. IN CLIMB-OUT FROM LOG LANDING WITH EXT LOAD AT AN ALT OF APPROX 400 FEET AND 69.5 PSI TORQ, PILOT HEARD A 'BANG' FOLLOWED BY A HIGH FREQ VIBR. AFTER CHECKING AL
- [SDR 96ZZZX5154](https://openairdocs.org/sdr/96ZZZX5154), Sep 12, 1996: BALLAST WEIGHT. DISLODGED. ON SEPTEMBER 12, 1996, A HILLER MODEL UH-12 ET OPERATED BY SUMMIT HELICOPTERS CRASHED, COMPLETELY DESTROYING THE HELICOPTER AND SERIOUSLY INJURING THE PILOT. TH
- [SDR AU960746](https://openairdocs.org/sdr/AU960746), May 26, 1996: CONTROL ROTOR. CRACKED. (AUS) MAIN ROTOR HEAD CONTROL ROTOR CRACKED AT SPAR END THROUGH THE FIRST BOLT HOLE FOR APPROXIMATELY 50% OF CIRCUMFERENCE - FOUND DURING INSPECTION IAW AD/HIL1
- [SDR 96ZZZX2945](https://openairdocs.org/sdr/96ZZZX2945), May 15, 1996: HUB. CRACKED. HUB FOUND CRACKED INSIDE HUB AT CONTROL ROTOR TRUNNION STUD HOLE. CRACK FOUND AT 50-HOUR DYE PENETRANT INSPECTION DURING C/W AD 73-20-3. SUBMITTER STATED CRACKS

All 58: https://openairdocs.org/model/rogerson-hiller-uh-12e/reports.md

## STCs that may be installed (OpenAirDocs) (74, 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 SR04637CH](https://openairdocs.org/stc/SR04637CH): Replacement of existing main ship battery with Lithium Ion Battery and installation of Annunciator Control Panel. Airwolf Aerospace LLC
- [STC SH3319NM](https://openairdocs.org/stc/SH3319NM): Installation of Precise Flight Pulselite Control Unit in the Landing /Taxi Recognition Visual Control Light system,. Precise Flight Inc
- [STC SH1152NW](https://openairdocs.org/stc/SH1152NW): Installation of the Automatic Flagman Model 135 Control Stick Grip. Air Products & Parts LLC
- [STC SR02704SE](https://openairdocs.org/stc/SR02704SE): Installation and maintenance of the Sunspot 36 and 46 series lights. AeroLED's Holdings LLC
- [STC SR00359BO](https://openairdocs.org/stc/SR00359BO): Installation of Parmetheus Plus LED PAR36 and PAR46 taxi and landing lights. Whelen Aerospace Technologies
- [STC SR01845SE](https://openairdocs.org/stc/SR01845SE): Installation of a barrier air filtration system. Cascade Flying Service LLC
- [STC SR00420NY](https://openairdocs.org/stc/SR00420NY): Installation of Airwolf remote mounted engine oil filter Model AFC-600. Airwolf Filter, Corp
- [STC SR01802WI](https://openairdocs.org/stc/SR01802WI): To allow the use of UL91 or UL94 (minimum) grade aviation fuel per ASTM D7547. Swift Fuels LLC
- [STC SR02394AK](https://openairdocs.org/stc/SR02394AK): Replacement of existing landing and/or hover light bulbs with Light Emitting Diode (LED) lighting system. Seaplanes North LLC
- [STC SA00068SE](https://openairdocs.org/stc/SA00068SE): Installation of fuel flow/pressure instruments. (W/TSIO-360-MB1). Electronics International Inc
- [STC SA2693NM](https://openairdocs.org/stc/SA2693NM): Installation of Electronics International digital volt/amp gauges and accessories. Electronics International Inc
- [STC SH381NW](https://openairdocs.org/stc/SH381NW): Installation and maintenance of engine auto reignition system. (UH-12E modified per STC SH178WE). Siam Hiller Holdings Inc
- [STC SH476NW](https://openairdocs.org/stc/SH476NW): Installation of an agricultural spray system. Siam Hiller Holdings Inc
- [STC SA02033AT](https://openairdocs.org/stc/SA02033AT): Modification to install an air-oil separator to prevent oil from being aspirated from the engine breather line. M-20 Oil Separators LLC
- [STC SH178WE](https://openairdocs.org/stc/SH178WE): Installation of Allison 250-C20/250-C20B engine and related changes. (UH-12E-L (4 place)). Siam Hiller Holdings Inc
- [STC SH248NW](https://openairdocs.org/stc/SH248NW): Installation and maintenance of exhaust ejector engine oil cooler system. (UH-12E modified per STC SH178WE). Siam Hiller Holdings Inc
- [STC SH288NW](https://openairdocs.org/stc/SH288NW): Installation of Hiller landing gear float kit No. 44012. (UH-12E modified per STC SH178WE). Siam Hiller Holdings Inc
- [STC SH296NW](https://openairdocs.org/stc/SH296NW): Installation of Hiller auxiliary fuel tanks kit No. 72041. (UH-12E modified per STC SH178WE). Siam Hiller Holdings Inc
- [STC SH298NW](https://openairdocs.org/stc/SH298NW): Installation and maintenance of a cabin heater system. (UH-12E modified per STC SH178WE). Siam Hiller Holdings Inc
- [STC SH300NW](https://openairdocs.org/stc/SH300NW): Installation of Soloy cargo racks. Siam Hiller Holdings Inc
- [STC SH322NW](https://openairdocs.org/stc/SH322NW): Installation of a Bendix fuel control/power governor system on the Allison 250-C20 turbine powered Hiller UH-12E rotorcraft. (UH-12E modified per STC SH178WE). Siam Hiller Holdings Inc
- [STC SH339NW](https://openairdocs.org/stc/SH339NW): Installation of transmission oil cooling system on the Allison250-C20 turbine powered Hiller UH-12E rotorcraft. (UH-12E modified per STC SH178WE). Siam Hiller Holdings Inc
- [STC SH506NW](https://openairdocs.org/stc/SH506NW): Installation of cargo release pedal. Siam Hiller Holdings Inc
- [STC SH560NW](https://openairdocs.org/stc/SH560NW): Installation and maintenance of engine inlet air cleaner system. Siam Hiller Holdings Inc
- [STC SH634NW](https://openairdocs.org/stc/SH634NW): Installation of Tundra Pads. Siam Hiller Holdings Inc
- [STC SA01258SE](https://openairdocs.org/stc/SA01258SE): Installation of the Automatic Flagman Dispenser Models in accordance with Automatic Flagman Master Drawing Lists specified in attached AML, or later FAA approved revision.This STC supercedes several existing STC s as listed in the notes on the attached AML. R-S Sales Inc
- [STC SA02520AT](https://openairdocs.org/stc/SA02520AT): Installation of M-20 Oil Separator, model 600-WP. M-20 Oil Separators LLC
- [STC SH849NW](https://openairdocs.org/stc/SH849NW): Installation of North American Industries, Inc., Model No. 5 Automatic Flagman. R-S Sales Inc
- [STC SH201WE](https://openairdocs.org/stc/SH201WE): Installation of stirrup assemblies to directional control pedals for operation by handicapped pilot. (US ARMY OH-13E 205A). Dallwig Barry C
- [STC SA2687NM](https://openairdocs.org/stc/SA2687NM): Installation of Truboplus/ Electronics Int'l gauges and switches. Aero Manufacturing Inc
- [STC SH12CE](https://openairdocs.org/stc/SH12CE): Replace existing engine induction air filter with AC Spark Plug Filter. Brackett Aero Filters Inc
- [STC SH767NW](https://openairdocs.org/stc/SH767NW): Installation of Chadwick Model C-512S spray system. Tower Aerospace, Inc
- [STC SR00135LA](https://openairdocs.org/stc/SR00135LA): Installation of Yehnert Tail Rotor Blades YH-278 as replacements for Hiller Tail Rotor Blades 55073. Yehnert Helicopters, Inc
- [STC SA1626NM PAGE 1](https://openairdocs.org/stc/SA1626NM%20PAGE%201): Installation of Electronics Int'l Digital EGT/CHT Instruments and accessories. (201 Series). Electronics International
- [STC SH5729NM](https://openairdocs.org/stc/SH5729NM): Full flow oil filter system. Grogan Don
- [STC SA2350NM PAGE 1](https://openairdocs.org/stc/SA2350NM%20PAGE%201): Installation of Electronics International Inc digital carburetor/outside air temperature gauges. Electronics International
- [STC SH300GL](https://openairdocs.org/stc/SH300GL): Installation of Facet Enterprises engine lubrication system scavenge filter. Facet Filter Products
- [STC SH2763SO](https://openairdocs.org/stc/SH2763SO): Installation of control rotor safety cable. JAARS Inc
- [STC SA4302NM](https://openairdocs.org/stc/SA4302NM): Installation of Electronics Int'l digital automatic engine analyzer. Electronics International
- [STC SH2611SO](https://openairdocs.org/stc/SH2611SO): Installation of cargo rack. JAARS Inc
- [STC SA3862NM PAGE 1](https://openairdocs.org/stc/SA3862NM%20PAGE%201): Installation of Electronics International Primary TIT/EGT/CHT instruments, remote switches and associated accessories. Electronics International
- [STC SH4173NM](https://openairdocs.org/stc/SH4173NM): Installation of Simplex Model 7600 modular electrical system. (US ARMY OH-13E M74A). Simplex Manufacturing Company
- [STC SH3362NM](https://openairdocs.org/stc/SH3362NM): Installation of a Tail Rotor Blade Protective Coating. Columbia Helicopters Inc
- [STC SA2190NM PAGE 1](https://openairdocs.org/stc/SA2190NM%20PAGE%201): Installation of electronics International Digital Volt/Amp Gauges and Accessories. Electronics International
- [STC SH4997SW](https://openairdocs.org/stc/SH4997SW): Installation of Lycoming TIVO-540-A2A engine. Craig Helicopters
- [STC SH302NM](https://openairdocs.org/stc/SH302NM): Installation of two Albany Int. dispersion pads, Drawing No. 21940 or 21961. Albany International
- [STC SH1014NW](https://openairdocs.org/stc/SH1014NW): Simplex Model 4600 spray system. Simplex Manufacturing Co
- [STC SH1147NW](https://openairdocs.org/stc/SH1147NW): Installation of a Chadwick Spray System. Helicopter Maintenance Corp
- [STC SH887NW](https://openairdocs.org/stc/SH887NW): Simplex Model 4650 spray system - agricultural. Simplex Manufacturing Co
- [STC SH948NW](https://openairdocs.org/stc/SH948NW): Installation of Model No. 5 automatic flagman. (UH-12E Restricted). North American Industries

All 74: https://openairdocs.org/model/rogerson-hiller-uh-12e/stcs.md

## The same model under other registry codes

Amateur-built copies and renamed makers get their own codes.

- [Hiller UH-12E](https://openairdocs.org/model/hiller-uh-12e): 101 registered aircraft, registry code 4360122
- [Hiller UH-12E](https://openairdocs.org/model/hiller-uh-12e): 2 registered aircraft, registry code 4360137
- [Hiller-Rogerson Helicopter UH12E](https://openairdocs.org/model/hiller-rogerson-helicopter-uh12e): 1 registered aircraft, registry code 4361101
- [Hiller-Fisher UH-12E](https://openairdocs.org/model/hiller-fisher-uh-12e): 0 registered aircraft, registry code 4360601
- [Hiller-Miller UH-12E](https://openairdocs.org/model/hiller-miller-uh-12e): 0 registered aircraft, registry code 4361201

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