# AD 82-20-52: Transmission

- Type: Airworthiness directive
- Status: Current
- Products: Columbia Helicopters 234
- Effective: April 4, 1983
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Rotorcraft
- Amendment: 39-4480
- Registered aircraft: 6 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/AFFCE21383A8A22B86256A4E004E47AD.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/82-20-52

## The airworthiness directive

82-20-52 BOEING VERTOL: Amendment 39-4480. Applies to Boeing Vertol Model 234 series helicopters, Manufacturer's Serial Numbers MJ001 through MJ006, equipped with forward transmission, P/N 234D1200-2, aft transmission, P/N 234D2200-2M, and combiner transmission, P/N 234D5200-5, certificated in all categories.

Compliance is required prior to further flight, after the effective date of this AD, unless already accomplished.

To prevent possible hazards in flight associated with transmission drive component failure, due to lubrication system contamination, accomplish the following:

a. Remove the forward transmission, aft transmission and combiner transmission, disassemble, inspect and repair in accordance with the accomplishment instructions of Boeing Vertol Bulletin 234-65-1027, Revision 2 contained in Boeing Vertol TWX Nos. 8-1420-3-4264, - 4267, and 4273, respectively dated September 23, 24, and 25, 1982, or FAA approved equivalent.

b. An equivalent method of compliance with this AD must be approved by the New York Aircraft Certification Office, FAA, New England Region, 181 South Franklin Avenue, Room 202, Valley Stream, New York 11581.

This amendment becomes effective November 5, 1982.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS H9EA](https://openairdocs.org/tcds/H9EA): Columbia Helicopters Inc.; names 1 of 1 models: 234

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 6 (6 by airframe model, 0 by engine model)
- Makers: Boeing-Vertol 6

Models with the most aircraft:

- [Boeing-Vertol 234](https://openairdocs.org/model/boeing-vertol-234): 6 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/82-20-52/models.md
Every aircraft: https://openairdocs.org/ad/82-20-52/aircraft.md

Its text cites no advisory circulars or STCs.

---
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.