# AD 82-24-01: Drivebelt Clutch Mechanism

- Type: Airworthiness directive
- Status: Current
- Products: Enstrom Helicopter Corporation, The 280, 280C, 280F, F-28A, F-28C and F-28F
- Effective: November 30, 1982
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Rotorcraft
- Amendment: 39-4497
- Registered aircraft: 208 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/61709FA8E9B5A5BF86256A4E00570822.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/82-24-01

## The airworthiness directive

82-24-01 ENSTROM HELICOPTER CORPORATION: Amendment 39-4497. Applies to Model F-28A, F-28C, F-28F, 280, 280C, and 280F helicopters certificated in all categories.

Compliance required as indicated unless already accomplished.

To prevent possible in-flight drivebelt clutch disengagement, accomplish the following:

  (a) Before further flight after the effective date of this AD, and thereafter at intervals not to exceed 100 hours' time in service from the last inspection:

  (1) Inspect the drivebelt clutch mechanism, in accordance with Enstrom Service Information Letter 0080, Revision A, dated August 4, 1982, or FAA approved equivalent, and the Maintenance/Manual Supplement for the respective Models, to ascertain that the mechanism is properly rigged.

NOTE: When properly rigged the clutch actuating cable should move freely allowing full clutch engagement. Clutch mechanisms experiencing binding of the clutch actuating cable, although properly rigged and lubricated, may have lubricant hardened in the cable assembly due to engine heat.

  (2) Replace any cable found to bind, preventing full clutch engagement, prior to further flight with suitable airworthy parts.

  (3) Lubricated the clutch actuating cable with Aero Shell 14 or FAA approved equivalent.

  (b) Within the next 25 hours' time in service after the effective date of this AD, unless already accomplished, install clutch cable heat shield P/N 28-16542-11 in accordance with Enstrom Service Directive Bulletin 0055, Revision A, dated April 2, 1982, or FAA approved equivalent.

NOTE: Enstrom Helicopter Models equipped with right pilot-in-command kits P/N 28- 01002 or P/N 28-01012; or electric clutch actuator kit P/N 28-01005 are exempt from this paragraph.

  (c) Within the next 50 hours' time in service after the effective date of this AD, unless already accomplished, install clutch engagement overcenter lock warning light kit P/N 28- 19035-3 in accordance with EnstromService Directive Bulletin 0061 dated September 20, 1982, or FAA approved equivalent.

  (d) Any equivalent method of compliance with this AD must be approved by the Manager, Chicago Aircraft Certification Office, Federal Aviation Administration, 2300 East Devon Avenue, Des Plaines, Illinois 60018.

  (e) In accordance with FAR 21.197, flight is permitted to a base where the inspection required by this AD may be accomplished.

This amendment becomes effective November 30, 1982.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS H1CE](https://openairdocs.org/tcds/H1CE): The Enstrom Helicopter Corporation; names 6 of 14 models: 280C, 280, F-28F, F-28C, 280F, F-28A

## 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: 208 (208 by airframe model, 0 by engine model)
- Makers: Enstrom 151, Enstrom Helicopter 57

Models with the most aircraft:

- [Enstrom F-28F](https://openairdocs.org/model/enstrom-f-28f): 62 aircraft (airframe model)
- [Enstrom Helicopter 280C](https://openairdocs.org/model/enstrom-helicopter-280c): 48 aircraft (airframe model)
- [Enstrom F-28C](https://openairdocs.org/model/enstrom-f-28c): 46 aircraft (airframe model)
- [Enstrom F-28A](https://openairdocs.org/model/enstrom-f-28a): 38 aircraft (airframe model)
- [Enstrom Helicopter 280F](https://openairdocs.org/model/enstrom-helicopter-280f): 6 aircraft (airframe model)
- [Enstrom 280](https://openairdocs.org/model/enstrom-280): 5 aircraft (airframe model)
- [Enstrom Helicopter F28F](https://openairdocs.org/model/enstrom-helicopter-f28f): 2 aircraft (airframe model)
- [Enstrom Helicopter F-28A](https://openairdocs.org/model/enstrom-helicopter-f-28a): 1 aircraft (airframe model)

All 8 models: https://openairdocs.org/ad/82-24-01/models.md
Every aircraft: https://openairdocs.org/ad/82-24-01/aircraft.md

Its text cites no advisory circulars or STCs.

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