# AD 67-01-02: Rotor Discs

- Type: Airworthiness directive
- Status: Current
- Products: General Electric CT58-100-1, T58-GE-5, T58-GE-1, CT58-100-2, CT58-110-1, CT58-110-2, CT58-140-1 and CT58-140-2
- Effective: August 24, 1976
- Published: August 12, 1976
- Issued: August 2, 1976
- Superseded by: Nothing supersedes this AD
- Product type: Engine
- Amendment: 39-2688
- Registered aircraft: 53 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7737D1C2DC6749BD86256E0100545C46.0001
- DRS record last changed: November 21, 2025
- Page: https://openairdocs.org/ad/67-01-02

## The airworthiness directive

67-01-02 GENERAL ELECTRIC: Amendment 39-332 as amended by Amendment 39-536 and Amendment 39-1085 is further amended by Amendment 39-2688. Applies to Model CT58-100-1, CT58-100-2, CT58-110-1, CT58-110-2, CT58-140-1, CT58-140-2, T58-GE-1 and T58-GE-5 Engines.

Compliance required as indicated.

To ensure adequate life limit margin for first stage compressor rotor discs, remove from service G.E. P/N's 37D400218P101, 37D400218P101 CEB #148, 37D400218P102, 37D400359P101, 37D400359P102, 3920T11P01, 3920T11P02, 5013T06P01, 5001T20P01, and 5001T20P02 as follows:

  (a) Discs with more than 9,700 cycles on October 15, 1970, prior to the accumulation of 200 additional cycles.

  (b) Discs with 9,700 cycles or less on October 15, 1970, before 9,900 cycles.

For the purposes of this AD a cycle is considered as any engine operating sequence involving engine start, at least one acceleration to a power required for take off, and shutdown.

Amendment 39-332 became effective December 29, 1966.

Amendment 39-536 became effective January 9, 1968.

Amendment 39-1085 became effective October 15, 1970.

This amendment 39-2688 becomes effective August 24, 1976.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 1E3](https://openairdocs.org/tcds/1E3): General Electric Company; names 5 of 5 models: CT58-100-2, CT58-140-2, CT58-140-1, CT58-110-1, CT58-110-2

## 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: 53 (0 by airframe model, 53 by engine model)
- Makers: Sikorsky 42, Boeing-Vertol 5, Columbia Helicopters 2, Boeing V-Columbia Helicopters 1, Carson Helicopters / Sikorsky 1, Kawasaki Vertol 1, Vertol 1

Models with the most aircraft:

- [GE CT58-140-2](https://openairdocs.org/engine/ge-ct58-140-2): 33 aircraft (engine model)
- [GE CT58-140-1](https://openairdocs.org/engine/ge-ct58-140-1): 20 aircraft (engine model)

All 2 models: https://openairdocs.org/ad/67-01-02/models.md
Every aircraft: https://openairdocs.org/ad/67-01-02/aircraft.md

Its text cites no advisory circulars or STCs.

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