# AD 86-10-05: First Stage Compressor Hub

- Type: Airworthiness directive
- Status: Current
- Products: Pratt & Whitney Canada PT6A-42
- Effective: June 5, 1986
- Superseded by: Nothing supersedes this AD
- Product type: Engine
- Amendment: 39-5266
- Registered aircraft: 2,435 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/30BD496B7D502E56862568400060C254.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/86-10-05

## The airworthiness directive

86-10-05 PRATT & WHITNEY CANADA: Amendment 39-5266. Applies to Pratt & Whitney Canada (PWC) PT6A-42 turboprop engines.

Compliance is required as indicated unless already accomplished.

To prevent first stage compressor hub failure, and possible engine failure, accomplish the following:

Remove from service Part Number (P/N) 3030356 first stage compressor hub on PWC Engine Model PT6A-42 with engine Serial Numbers 93001 thru 93804 inclusive at or before 5,000 total cycles in accordance with PWC Service Bulletin (SB) 3002, Revision 12, dated November 9, 1983, or FAA approved equivalent.

NOTE: The 15,000 hour life limit remains unaffected by this airworthiness directive (AD).

Aircraft may be ferried in accordance with the provisions of FAR 21.197 and 21.199 to a base where the AD can be accomplished.

PWC SB 3002, Revision 12, dated November 9, 1983, is incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received this document from the manufacturer may obtain copies upon request to Pratt & Whitney Canada, Longueuil, Quebec, Canada, J4K-4X9. This document also may be examined at the Office of the Regional Counsel, Rules Docket 85-ANE-29, Federal Aviation Administration, 12 New England Executive Park, Burlington, Massachusetts 01803.

This amendment becomes effective on June 5, 1986.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS E4EA](https://openairdocs.org/tcds/E4EA): Pratt & Whitney Canada Corp.; names 1 of 54 models: PT6A-42

## 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: 2,435 (0 by airframe model, 2,435 by engine model)
- Makers: Beech 574, Cessna 435, Air Tractor 394, Raytheon 298, Piper 248, Pilatus 110, Socata 92, Dehavilland 57, Ayres 46, Epic 20

Models with the most aircraft:

- [Pratt & Whitney PT6A series](https://openairdocs.org/engine/pratt-whitney-pt6a-series): 2,217 aircraft (engine model)
- [Pratt & Whitney Canada PT6A-42](https://openairdocs.org/engine/pratt-whitney-canada-pt6a-42): 172 aircraft (engine model)
- [Pratt & Whitney PT6 series](https://openairdocs.org/engine/pratt-whitney-pt6-series): 43 aircraft (engine model)
- [Pratt & Whitney Canada PT6 series](https://openairdocs.org/engine/pratt-whitney-canada-pt6-series): 3 aircraft (engine model)

All 5 models: https://openairdocs.org/ad/86-10-05/models.md
Every aircraft: https://openairdocs.org/ad/86-10-05/aircraft.md

Its text cites no advisory circulars or STCs.

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