# AD 74-22-07: Compressor Rotor Disks

- Type: Airworthiness directive
- Status: Current
- Products: Honeywell International T5313A
- Effective: October 31, 1974
- Superseded by: Nothing supersedes this AD
- Product type: Engine
- Amendment: 39-1997
- Registered aircraft: 95 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/8BA7B8DAC6E79D658625682A0072D9DE.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/74-22-07

## The airworthiness directive

74-22-07 AVCO LYCOMING: Amendment 39-1997. Applies to all Avco Lycoming T5313A turboshaft engines. Compliance required, unless already accomplished, prior to the accumulation of 100 hours in service after the effective date of this AD. To prevent possible compressor disk or centrifugal impeller assembly failures leading to partial or complete loss of engine power, remove and replace the first, second, third, fourth, and fifth stage compressor rotor disks and centrifugal impeller assemblies in accordance with the table below.

Remove P/N 1st Stage Compressor 1-100-700-05 Rotor Disk Assembly Socket Head Cap Screw 1-100-214-06 2nd Stage Compressor 1-100-710-05 Rotor Disk Assembly 1-100-710-09 1-100-710-10 3rd Stage Compressor 1-100-230-06 Rotor Disk Assembly 1-100-230-07 4th Stage Compressor 1-100-240-08 Rotor Disk Assembly 1-100-240-10 1-100-240-15 5th Stage Compressor 1-100-450-09 Rotor Disk Assembly 1st Stage Compressor 1-100-201-05 Rotor Spacer 2nd Stage Compressor 1-100-202-03 Rotor Spacer 3rd Stage Compressor 1-100-203-03 Rotor Spacer 4th Stage Compressor 1-100-204-06 Rotor Spacer 5th Stage Compressor 1-100-416-07 Rotor Spacer Sleeve Seal 1-100-482-01 Centrifugal Compressor 1-100-440-07 Impeller Assembly Compressor Rotor 1-100-207-05 Sleeve Compressor Rear Shaft 1-100-137-04

Install P/N Front Shaft Assembly 1-101-080-01 Socket Head Cap Screw 1-100-506-02 Compressor Rotor 1-101-090-02 Subassembly Centrifugal Compressor 1-100-078-08 Impeller Assembly Compressor Rear Shaft 1-100-501-01 Lock Cup Washer 1-100-148-01 Double Hexagon Extended 1-100-502-02 Washer Head Bolt

Upon submission of substantiating data through an FAA Maintenance Inspector, the Chief, Engineering and Manufacturing Branch, FAA, New England Region, may adjust the compliance time. NOTE: (Avco Lycoming Service BulletinNumber 0037 pertains to this subject.) This amendment is effective October 31, 1974.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS E17EA](https://openairdocs.org/tcds/E17EA): Ozark Aeroworks LLC; names 1 of 6 models: T5313A

## 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: 95 (0 by airframe model, 95 by engine model)
- Makers: Bell 67, Garlick Helicopters 7, Grumman 4, Southwest Florida 3, Western International Avia 2, Williams Helicopter 2, Anderson Douglas 1, Bell-Colonial 1, Bell-Sw Florida Avn 1, Christen Industries 1

Models with the most aircraft:

- [Lycoming T-53 series](https://openairdocs.org/engine/lycoming-t-53-series): 95 aircraft (engine model)

All 3 models: https://openairdocs.org/ad/74-22-07/models.md
Every aircraft: https://openairdocs.org/ad/74-22-07/aircraft.md

Its text cites no advisory circulars or STCs.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.