AD 64-01-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airborne Manufacturing, Inc. | Vacuum Pumps | Airworthiness Directives; Airborne Mechanisms: Applies to All Aircraft Using Vacuum Pumps Models 113A5, 113A8, 113A1, And 113A2 |
Unsafe Condition
Defective splined drive couplings (P/N B1001A2) can render vacuum flight instruments inoperative.
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Required Actions
Replace vacuum pump splined couplings per Piper Service Bulletin No. 218 before further flight on Piper aircraft. Inspect couplings for a bright yellow band on the shoulder; replace those without the yellow band before further flight on other aircraft.
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Compliance Time
within 10 hours' time in service after the effective date of this AD
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Affected Aircraft
All aircraft using Vacuum Pumps Models 113A5, 113A8, 113A1, and 113A2 from Airborne Manufacturing, Inc., with specific serial ranges: 7G2494-7G2678, 8G2679-8G2892, 9G2893-9G3250, 10G3251-10G3714, and those where P/N B1001A2 couplings were replaced after July 22, 1963.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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