# AD 72-03-06: Turbine Wheels

- Type: Airworthiness directive
- Status: Current
- Products: Rolls-Royce 250-B15A, 250-B15E, 250-B15G, 250-B17, 250-C10B (T63-A-5A), 250-C10D (T63-A-700), 250-C18, 250-C18A, 250-C18B, 250-C18C, 250-C19 and 250-C20
- Effective: February 8, 1972
- Published: February 4, 1972
- Issued: January 28, 1972
- Superseded by: Nothing supersedes this AD
- Product type: Engine
- Amendment: 39-1390
- Registered aircraft: 758 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/62FBED053DF81A368625682700664276.0001
- DRS record last changed: November 21, 2025
- Page: https://openairdocs.org/ad/72-03-06

## The airworthiness directive

72-03-06 ALLISON: Amdt. 39-1390. Applies to Models 250-B15A, 250-B15E, 250-B15G, 250-B17, 250-C10B, 250-C10D, 250-C18, 250-C18A, 250-C18B, 250-C18C, 250-C19 and 250-C20 engines. Compliance: Required as indicated, unless already accomplished. To ensure adequate life limit margin for Allison P/Ns 6857912 and 6871872 second stage turbine wheels, accomplish the following: A) Within the next 50 hours' time in service after the effective date of this AD, remove from service all P/Ns 6857912 and 6871872 second stage stabilizer trim and to maintain stabilizer control capability, accomplish the following: (a) For airplanes incorporating stabilizer trim modules having over 1500 hours' time in service. B) Prior to their exceeding 1550 hours' time in service, remove from service all P/Ns 6857912 and 6871872 second stage turbine wheels having 1500 hours or less time in service on the effective date of this AD. Allison Commercial Service Letter No. 250CSL-10, dated December 9, 1971, pertains to this subject. This amendment becomes effective February 8, 1972.

## Affected data sheets (2) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS E4CE](https://openairdocs.org/tcds/E4CE): Rolls-Royce Corporation; names 8 of 23 models: 250-C19, 250-C18, 250-C20, 250-C10D (T63-A-700), 250-C18A, 250-C18B, 250-C10B (T63-A-5A), 250-C18C
- [TCDS E10CE](https://openairdocs.org/tcds/E10CE): Rolls-Royce Corporation; names 4 of 11 models: 250-B15G, 250-B15E, 250-B17, 250-B15A

## 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: 758 (0 by airframe model, 758 by engine model)
- Makers: Bell 434, Hughes Helicopters 62, Mcdonnell Douglas Helicopter 62, Hughes 41, Hiller 20, Agusta 18, MD Helicopters 18, Siai-Marchetti 18, Aerospatiale 11, Cessna 10

Models with the most aircraft:

- [Allison 250-C20 series](https://openairdocs.org/engine/allison-250-c20-series): 530 aircraft (engine model)
- [Allison 250 series](https://openairdocs.org/engine/allison-250-series): 79 aircraft (engine model)
- [Allison 250-C20](https://openairdocs.org/engine/allison-250-c20): 54 aircraft (engine model)
- [Rolls-Royce 250-C20](https://openairdocs.org/engine/rolls-royce-250-c20): 42 aircraft (engine model)
- [Allison 250-B17 series](https://openairdocs.org/engine/allison-250-b17-series): 14 aircraft (engine model)
- [Allison 250-C10D](https://openairdocs.org/engine/allison-250-c10d): 13 aircraft (engine model)
- [Allison 250-B15G](https://openairdocs.org/engine/allison-250-b15g): 12 aircraft (engine model)
- [Rolls-Royce 250-C10D](https://openairdocs.org/engine/rolls-royce-250-c10d): 8 aircraft (engine model)
- [Allison 250-C18](https://openairdocs.org/engine/allison-250-c18): 2 aircraft (engine model)
- [Allison 250-C18B](https://openairdocs.org/engine/allison-250-c18b): 2 aircraft (engine model)
- [Rolls-Royce 250-B15G](https://openairdocs.org/engine/rolls-royce-250-b15g): 1 aircraft (engine model)
- [Rolls-Royce 250-C18](https://openairdocs.org/engine/rolls-royce-250-c18): 1 aircraft (engine model)

All 14 models: https://openairdocs.org/ad/72-03-06/models.md
Every aircraft: https://openairdocs.org/ad/72-03-06/aircraft.md

Its text cites no advisory circulars or STCs.

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