# AD 66-21-01: Rotor Disc Spacer Assemblies

- Type: Airworthiness directive
- Status: Current
- Products: Pratt & Whitney Division JT3C-12 and JT3C-7
- Effective: September 30, 1966
- Superseded by: Nothing supersedes this AD
- Product type: Engine
- Amendment: 39-279
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/88A6900CB3E6E1DF8625685B006071B8.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/66-21-01

## The airworthiness directive

66-21-01 PRATT & WHITNEY: Amdt. 39-279 Part 39 Federal Register August 31, 1966. Applies to Model JT3C-7 and JT3C-12 Turbojet Engines. Compliance required as indicated. Within the next 6,000 hours' time in service after the effective date of this AD or at the next compressor disassembly, whichever occurs first, unless already accomplished, replace the first, fifth and sixth stage compressor rotor disc spacer assemblies, P/N's 359410, 359414, and 359415, with spacer assemblies, P/N's 460599, 460604, and 460606, respectively. (Pratt & Whitney Aircraft Turbojet Engine Service Bulletin No. 689, Revision No. 3, dated November 16, 1964, pertains to this subject.) This directive effective September 30, 1966.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS E-290](https://openairdocs.org/tcds/E-290): Pratt & Whitney Division; names 2 of 4 models: JT3C-7, JT3C-12

## Registered aircraft it may apply to (OpenAirDocs)

No registered aircraft matched the models it names.

Its text cites no advisory circulars or STCs.

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