# N239CH: 1981 Boeing-Vertol 234

- Status: Valid registration
- Airframe: [Boeing-Vertol 234](https://openairdocs.org/model/boeing-vertol-234) (registry code 1385051, 44 seats)
- Engine: [Honeywell AL5512](https://openairdocs.org/engine/honeywell-al5512) (registry code 33903)
- Data sheets: [TCDS H9EA](https://openairdocs.org/tcds/H9EA) (Columbia Helicopters Inc.), [TCDS E4NE](https://openairdocs.org/tcds/E4NE) (Honeywell Aerospace US LLC) (OpenAirDocs)
- Serial number: MJ006
- Year built: 1981
- Type: Rotorcraft
- Engine type: Turbo-shaft
- Airworthiness: Experimental, research and development
- Airworthiness date: March 14, 2026
- Certificate issued: May 4, 2017
- Expires: May 31, 2027
- Mode S code: A22A29
- Registered owner: [Columbia Helicopters Inc](https://openairdocs.org/faa-owner/COLUMBIA%20HELICOPTERS%20INC)
- Location: [Aurora, OR](https://openairdocs.org/faa-place/OR/Aurora)
- Owner type: Corporation
- Owner's area on the map: 45.2403° N, 122.7936° W: Placed by OpenAirDocs at the center of ZIP code 97002, within about 4 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=239CH
- Page: https://openairdocs.org/aircraft/N239CH

From the FAA registry file of October 24, 2026. ADs below are matched by the registry's airframe and engine model codes. They may apply; each AD's applicability can narrow it by serial number, part number or installed equipment. This is not a compliance determination.

## ADs that may apply (OpenAirDocs): 21 in force

### Matched by airframe (Boeing-Vertol 234)

- [AD 2025-07-01](https://openairdocs.org/ad/2025-07-01): Air Data Computer · Synthetic Vision Electronic Flight Information System (Arrow STC SR09595RC or ST01523WI). Effective May 15, 2025
- [AD 2024-20-05](https://openairdocs.org/ad/2024-20-05): Flight control systems · Columbia Helicopters 234 and CH-47D. Effective Oct 28, 2024
- [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 2021-23-06](https://openairdocs.org/ad/2021-23-06): Rotor flight controls · Columbia Helicopters 234 and CH-47D. Effective Jan 4, 2022
- [AD 2018-16-11](https://openairdocs.org/ad/2018-16-11): Main Rotor Head · Billings Flying Service CH-47D, 234, CH-47D and 1 more. Effective Sep 17, 2018
- [AD 2014-13-04](https://openairdocs.org/ad/2014-13-04): Nacelle/Pylon Structure and Main Rotor Blades · Columbia Helicopters 234. Effective Jul 15, 2014
- [AD 2004-06-51](https://openairdocs.org/ad/2004-06-51): Upper shaft extension · Columbia Helicopters 234. Effective Jun 18, 2004
- [AD 2002-15-02](https://openairdocs.org/ad/2002-15-02): Compressor Wheels · British Aerospace Regional Jetstream Series 3101, 234, Mystere-Falcon 20 - C5 and 22 more. Effective Aug 28, 2002
- [AD 95-22-09](https://openairdocs.org/ad/95-22-09): Spiral Bevel Ring Gear Bolted Connection · Columbia Helicopters 234. Effective Dec 6, 1995
- [AD 91-03-01](https://openairdocs.org/ad/91-03-01): Rotor Blade Rod Ends · Columbia Helicopters 234. Effective Feb 14, 1991
- [AD 87-25-05](https://openairdocs.org/ad/87-25-05): Landing Gear Spindle · Columbia Helicopters 234. Effective Dec 15, 1987
- [AD 86-23-51](https://openairdocs.org/ad/86-23-51): Transmissions · Columbia Helicopters 234. Effective Jul 20, 1987
- [AD 84-10-51 R1](https://openairdocs.org/ad/84-10-51-R1): Forward Rotor Drive Shaft · Columbia Helicopters 234. Effective Jul 24, 1986
- [AD 85-23-51 R1](https://openairdocs.org/ad/85-23-51-R1): Main Rotor Head Vertical Hinge Pins Inspection · Columbia Helicopters 234. Effective Mar 31, 1986
- [AD 84-15-03](https://openairdocs.org/ad/84-15-03): Cylinders -Flight Control System · Columbia Helicopters 234. Effective Aug 3, 1984
- [AD 83-18-51 R2](https://openairdocs.org/ad/83-18-51-R2): Pitch Shafts · Columbia Helicopters 234. Effective May 31, 1984
- [AD 84-03-51](https://openairdocs.org/ad/84-03-51): Forward Main Rotor Tie Bars · Columbia Helicopters 234. Effective Mar 14, 1984
- [AD 83-16-51](https://openairdocs.org/ad/83-16-51): Main Rotor Blade Tip Cap · Columbia Helicopters 234. Effective Oct 26, 1983
- [AD 82-20-52](https://openairdocs.org/ad/82-20-52): Transmission · Columbia Helicopters 234. Effective Apr 4, 1983
- [AD 82-20-06 R1](https://openairdocs.org/ad/82-20-06-R1): Main Rotor Hubs Inspection · Columbia Helicopters 234. Effective Oct 15, 1982
- [AD T83-25-51 R1](https://openairdocs.org/ad/T83-25-51-R1): Rotor Head Horizontal Hinge Pins · Columbia Helicopters 234

### Matched by engine (Honeywell AL5512)

None in force.

### 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

## Information bulletins (advisory) (1 in force)

- [SAIB SW-11-03](https://openairdocs.org/saib/SW-11-03): Pitch Housings Vertical Pin Lugs. Issued Oct 22, 2010

## NTSB investigations (1)

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 LAX08CA282](https://openairdocs.org/ntsb/LAX08CA282), Aug 22, 2008: Boeing BV234 (N239CH), Burns, OR, substantial damage. Probable cause: The pilot's failure to maintain clearance from obstacles while taxiing.

## FAA accident and incident reports (1)

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.

- [Accident 20080822842749A](https://openairdocs.org/incident/20080822842749A), Aug 22, 2008: Boeing 234 (N239CH), Burns, OR, Substantial damage. (-23) Pilot was ferrying the aircraft from portland to Utah to perform removal of equipment from high lakes in Utah. The pilot stopped for fuel in Burns, OR…

## Service difficulty reports (12)

As reported by operators and repair stations. Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model.

- [SDR CHIA202009064669](https://openairdocs.org/sdr/CHIA202009064669), Sep 6, 2020: CONTROL BOX. FAILED. INTERIM SUPPLEMENTAL INFORMATION: THE OVERSPEED CONTROL BOX LISTED BELOW HAS BEEN RETURNED TO THE OEM (HONEYWELL) AND IS PRESENTLY UNDER EVALUATION BY THE OEM A
- [SDR CHIA2020091064669](https://openairdocs.org/sdr/CHIA2020091064669), Sep 6, 2020: CONTROL BOX. FAILED. PILOT ACCOUNT: DURING FIRE FIGHTING MISSION, NR 2 ENGINE ROLLED BACK TO INTERMEDIATE SETTING (LESS THAT FLIGHT RPM WITH RRPM DECAY, ABOVE GROUND IDLE). THIS OCC
- [SDR CHIA2020090624671](https://openairdocs.org/sdr/CHIA2020090624671), Sep 2, 2020: CONTROL BOX. FAILED. NR 2 ENGINE ROLLBACK ON APPROACH TO WATER SOURCE. ENGINE SECURED PER EMERGENCY ABNORMAL CHECKLIST. COULD NOT FIND ANY DEPENDENCY DURING T/S. REMOVED AND REPLACE
- [SDR CHIA202009174694](https://openairdocs.org/sdr/CHIA202009174694), Sep 17, 2019: ENGINE. POWER LOSS. ON APPROACH TO DIP SITE NR 2 ENGINE FAILED TO RESPOND. NR 2 HUNG BACK AT AROUND 20% TQ, PILOTS WENT INTO EMERGENCY ENGINE TRIM & MANUALLY BEEPED ENGINE WITH NO 
- [SDR CHIR0201802140001](https://openairdocs.org/sdr/CHIR0201802140001), Feb 11, 2018: POWERPACK. SHORTED. INFLIGHT, THE PILOT RECEIVED NO RESPONSE FROM THE PUMPS OR GATE VALVE ON THE SEI POWERPACK SYSTEM. THE 25 AMP CIRCUIT BREAKER WAS UNABLE TO BE RESET. PILOTS NOT
- [SDR CHIR201608262510](https://openairdocs.org/sdr/CHIR201608262510), Aug 24, 2016: BOLT. BROKEN. WHILE PERFORMING AD 95-22-09, PARA A, 250 HR SPIRAL BEVEL INSPECTION OF THE AFT TRANSMISSION NR 12 BOLT BROKE DURING INITIAL TORQUE CHECK AT 275" LB.
- [SDR CHI2003F00000](https://openairdocs.org/sdr/CHI2003F00000), Jun 4, 2003: BAR. CRACKED. DURING NORMAL ROTOR HEAD MAINTENANCE, THE TWO REPORTED TIE BARS WERE FOUND WITH NUMEROUS DEFECTS. THE DEFECTS CONSISTED OF SEVERAL CRACKED PLATES AT THE TIE BAR
- [SDR CHI3212](https://openairdocs.org/sdr/CHI3212), Sep 23, 1998: ACTUATOR. MALFUNCTIONED. PILOT ATTEMPTED TO APPLY SLIGHT AMOUNT OF AFT CYCLIC TO SLOW HELICOPTER AND EXTERNAL LOAD. THE CYCLIC WOULD NOT MOVE AFT OR FORWARD. NO SIGN OF ANYTHING BLOCKIN
- [SDR CHI1773](https://openairdocs.org/sdr/CHI1773), Apr 28, 1997: SLEEVE. BROKEN. THE HORIZONTAL HINGE PIN WAS REMOVED FOR A LEAKING SEAL. THE HINGE PIN WAS REMOVED AND THE LEADING SLEEVE REMAINED IN THE BEARING. THE SLEEVE WAS SPLIT AND THE 
- [SDR CHI1514](https://openairdocs.org/sdr/CHI1514), Dec 15, 1995: BEARING. FAILED. POST-FLIGHT CHECK REVEALED BLACK GREASE RUBBER AND WIRE FRAGMENTS COMING OUT OF THE GAP BETWEEN THE STATIONARY RING AND THE ROTATING RING. UNIT WAS REMOVED AND 
- [SDR CHI1488](https://openairdocs.org/sdr/CHI1488), Aug 27, 1995: COMPUTER. FAILED. AT MORNING START-UP DURING THE AFCS CHECK, WHEN THE AFCS WAS TURNED ON, THE ROLL EXTENSIBLE LINK STARTED MOVING ERRATICALLY. THE PROBLEM WAS ISOLATED TO THE NR 
- [SDR CHI1478](https://openairdocs.org/sdr/CHI1478), Aug 8, 1995: SWITCH. BROKEN. PILOTS REPORTED INTERMITTENT NR 1 ENGINE TRANSMISSION HOT LIGHT. DURING TROUBLESHOOTING, FOUND M2001-517 TEMP SWITCH BROKE IN HALF AND WIRES PULLED OUT AT CANNO

## STCs that may be installed (OpenAirDocs) (20)

Approved for this aircraft's airframe or engine model, in force first, then newest. The registry doesn't record which STCs an aircraft has; its records do.

### Approved for the airframe (Boeing-Vertol 234)

- [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 SR00925DE](https://openairdocs.org/stc/SR00925DE): Installation of Garmin GTX 335/335R and GTX345/345R transponders to provide ADS-B Out and In functionality. Peregrine
- [STC SR02670SE](https://openairdocs.org/stc/SR02670SE): Installation of Simplex Model 347 Fire Fighting Tank System (FFTS); Serial Number MJ022. Columbia Helicopters Inc
- [STC SH5762NM](https://openairdocs.org/stc/SH5762NM): Installation of Advanced Technology Aircraft Company engine barrier filter in accordance with Advanced Technology Aircraft Company Master Drawing List No. 234, Revision C, dated August 17, 1992, or later FAA approved revisions. This STC is issued for use in the restricted category only, and the rotorcraft must be operated accordingly with the ATAC engine barrier filter installed. Waukena Flying Services Inc
- [STC SH5685NM](https://openairdocs.org/stc/SH5685NM): Installation of an improved N2 Control System in accordance with Columbia Helicopters, Inc. (CHI) Master Drawing List 93-AVI-0304, Revision H, dated August 12, 2011, or later FAA-approved revision. Columbia Helicopters Inc
- [STC SR01041SE](https://openairdocs.org/stc/SR01041SE): Modification and installation of the Columbia Helicopters, Inc. C34E2057 Utility Interior Configuration, 1-19 Passengers, in accordance with Columbia Helicopters, Inc. (CHI) Master Drawing List No. 01-RDE-0602, Revision A, dated January 14, 2002, or later FAA approved revision. The modified interior will be maintained in accordance with Columbia Helicopter's FAA approved Model 234 manual, Continuous Airworthiness Maintenance Program. Columbia Helicopters Inc
- [STC SH2928NM](https://openairdocs.org/stc/SH2928NM): Installation of an improved engine electrical wiring harness on Boeing Vertol 234 with Lycoming AL5512 engines. Columbia Helicopters Inc
- [STC SR01674SE](https://openairdocs.org/stc/SR01674SE): Fabrication of Columbia Helicopters, Inc. (CHI) Support Assembly, part number C34D6001-9. Columbia Helicopters Inc
- [STC SR01392SE](https://openairdocs.org/stc/SR01392SE): Fabrication and Installation of "Provisional Hardpoints" per Columbia Helicopter Master Drawing List, Document No. 04-RDE-0208, revision B, dated March 17, 2004, or later FAA approved revision and maintained in accordance with Instructions for Continued Airworthiness WAI0204-04, Revision 0, dated May 6, 2003, or later FAA approved revision. Columbia Helicopters Inc
- [STC SR00811NY](https://openairdocs.org/stc/SR00811NY): Installation of Technisonic Industries Limited TFM-138 series transceiver models. Technisonic Industries Limited
- [STC SR01834NY](https://openairdocs.org/stc/SR01834NY): Installation of Globalstar Satellite Telephone System. Atlantic Avionics Inc
- [STC SH2720SO](https://openairdocs.org/stc/SH2720SO): Installation of Aero Aire Model 234 Environmental Control System (ECS) in accordance with Aero Aire Master Drawing List Document No. A234R002, Revision B, dated March 7, 1990, or later FAA Approved Revision. Enviro Systems Inc
- [STC SR00955SE](https://openairdocs.org/stc/SR00955SE): Replacement of the pilot and co-pilot cockpit doors with bubble doors in accordance with McClenahan Engineering Master Drawing List No. DM0116-3, dated June 2, 2001, or later FAA approved revision. (S/N's MJ017 and MJ022). Columbia Helicopters Inc
- [STC SR00956SE](https://openairdocs.org/stc/SR00956SE): Installation of offset cyclic and collective control sticks in accordance with McClenahan Engineering Master Drawing List No. DM0118-3, Revision A, dated July 13, 2001, or later FAA approved revision. For serial numbers MJ017 and MJ022 only. Columbia Helicopters Inc
- [STC SR00875SE](https://openairdocs.org/stc/SR00875SE): Installation of Honeywell Solid State Flight Data Recorder (SSFDR) and Teledyne Digital Flight Data Acquisition Unit (DFDAU) per Columbia Helicopters, Inc., Master Drawing List 99-AVI-0221, Revision B, dated February 14, 2001, or later FAA approved revision. Columbia Helicopters Inc
- [STC SR00841SE](https://openairdocs.org/stc/SR00841SE): Replacement of Boeing forward (P/N's 114D1245-7 or -8) and aft (P/N's 114D1350-1, -2, or -3) main rotor masts with Columbia Helicopter main rotor mast P/N's C34D5003-1 and C34D6002-9, respectively. Columbia Helicopters Inc
- [STC SR00516SE](https://openairdocs.org/stc/SR00516SE): Receiving inspection and modification of amilitary surplused CH-47 transmission housing P/N 114D6241-1 for replacement of the commercial Boeing transmission housing assemby P/N 234D6241-1. Columbia Helicopters Inc
- [STC SR00288SE](https://openairdocs.org/stc/SR00288SE): Modification of internal auxiliary fuel tank from a dry-cell type to a wet-cell type. Columbia Helicopters Inc
- [STC SH5973NM](https://openairdocs.org/stc/SH5973NM): Approve increased altitude and weight capability when operated in Category And B operations. Columbia Helicopters Inc
- [STC SH2930NM](https://openairdocs.org/stc/SH2930NM): Installation of an electronic weighting system. Measurement Systems Intl

## Related

- Other Boeing-Vertol 234 aircraft: https://openairdocs.org/model/boeing-vertol-234/aircraft.md
- The Honeywell AL5512 engine: https://openairdocs.org/engine/honeywell-al5512.md

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