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FAA
Federal Aviation Administration Department of Transportation
Aviation Safety
AIRWORTHINESS DIRECTIVE
Generated by Aircraft-logs.com — March 22, 2026

AD 75-22-02 ACTIVE

Secondary Failure N2 Accessory Drive Shaft
Key Information
AD Number 75-22-02 Status Active
Effective Date October 29, 1975 Issue Date Not specified
Docket Number Unknown Amendment 39-2385
Product Type ["Engine"] Product Subtype Not specified
CFR Part --- - Part 39 CFR Section N/A
Citation This information is not available.
Applicability
Manufacturer(s) Honeywell International Inc.
Model(s) T5307A T5309A T5309B T5309C T5311A T5311B T5313A T5313B T5317A
Regulatory Text

75-22-02 AVCO LYCOMING: Amendment 39-2385. Applies to all Avco Lycoming T53 series engines.
To prevent secondary failure of the N2 accessory drive shaft, as a result of binding of the torquemeter boost pump drive shaft, remove torquemeter boost pump, Part Number 1-300-221-01 or Part Number 1-300-221- 02, and replace with Part Number 1-300-221-03 or Part Number 1-300-221-04 within 200 hours time in service after the effective date of this AD.
NOTE: Avco Lycoming Service Bulletin Number 0031 pertains to this subject.
This amendment becomes effective October 29, 1975.

AD 75-22-02 — Secondary Failure N2 Accessory Drive Shaft
Printed from Aircraft-logs.com — 03/22/2026