# AD 67-28-05: First Stage Fan Hub

- Type: Airworthiness directive
- Status: Current
- Products: Pratt & Whitney Division JT3D-1, JT3D-1-MC6, JT3D-1-MC7, JT3D-3 and JT3D-3B
- Effective: October 24, 1967
- Superseded by: Nothing supersedes this AD
- Product type: Engine
- Amendment: 39-495
- Registered aircraft: 5 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/9CDBA6A8023F1B668625685B00609475.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/67-28-05

## The airworthiness directive

67-28-05 PRATT & WHITNEY: Amdt. 39-495 Part 39 Federal Register October 21, 1967. Applies to Models JT3D-1, JT3D-1-MC6, JT3D-1-MC7, JT3D-3, and JT3D-3B Turbofan Engines with First Stage Fan Hubs, P/N 431001, that have not been inspected in accordance with Pratt & Whitney Aircraft Turbojet Engine Service Bulletin No. 1219, dated June 3, 1966, or later FAA-approved revision, and reworked in accordance with Pratt & Whitney Aircraft turbojet engine Service Bulletin No. 1066; dated October 25, 1965, or Service Bulletin No. 1219, dated June 3, 1966, or later FAA-approved revisions of these bulletins. Compliance required as indicated. (a) Before further flight, unless already accomplished within the last four cycles and thereafter at intervals not to exceed four cycles from the last inspection, visually inspect front of first stage fan hub, P/N 431001, with 6000 or more cycles since new for the JT3D-1, JT3D-1-MC6, JT3D-1-MC7, or JT3D-3 and JT3D- 3B turbofan engine models operated at JT3D-1 engine power ratings, or 4000 or more cycles since new for turbofan engine models operated at JT3D-3 or JT3D-3B engine power ratings, for indications of cracks emanating from root of fan blade slots, using a glass of at least 3-power. (b) If indications of cracks are found, remove hub from service before further flight, except that the airplane may be flown in accordance with FAR 21-197 to a base where the hub can be removed. (c) For the purposes of this AD, the number of cycles equals the number of landings (including touch- and-go landings). (d) Upon submission of substantiating data through an FAA maintenance inspector, the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region, may adjust the repetitive inspection period of the operator. This amendment effective October 24, 1967. This Supersedes AD 66-17-03.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 1E8](https://openairdocs.org/tcds/1E8): Pratt & Whitney Division; names 5 of 11 models: JT3D-3, JT3D-1-MC6, JT3D-1-MC7, JT3D-3B, JT3D-1

## 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: 5 (0 by airframe model, 5 by engine model)
- Makers: Boeing 3, Mcdonnell Douglas 2

Models with the most aircraft:

- [Pratt & Whitney JT3D-3B](https://openairdocs.org/engine/pratt-whitney-jt3d-3b): 3 aircraft (engine model)
- [Pratt & Whitney JT3D series](https://openairdocs.org/engine/pratt-whitney-jt3d-series): 2 aircraft (engine model)

All 2 models: https://openairdocs.org/ad/67-28-05/models.md
Every aircraft: https://openairdocs.org/ad/67-28-05/aircraft.md

Its text cites no advisory circulars or STCs.

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