AD 72-15-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Prestolite Company | Alternator Cooling Fans | Airworthiness Directives; PRESTOLITE: Applies to Prestolite Alternator Cooling Fans |
Unsafe Condition
In-service failures of Prestolite Alternator Cooling Fans (P/N's PU1605 and PU1605A) due to damage, distortion, cracks, or breaks, which could result from improper handling during maintenance such as using the fan to prevent alternator shaft rotation.
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Required Actions
Inspect alternator cooling fans for damage, distortion, cracks, or breaks within specified intervals. Replace damaged fans with airworthy units per Prestolite Service Bulletin ASM-4. Replace PU1605/PU1605A fans with 90-2241 fans (PU604A and PU605A) by January 1, 1973, per Service Bulletin ASM-8 or approved alternate.
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Compliance Time
Within the next 25 hours' time in service unless already accomplished within the previous 75 hours' time in service; thereafter at intervals not to exceed 100 hours' time in service. For part replacement, no later than January 1, 1973.
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Affected Aircraft
Prestolite Company Alternator Cooling Fans (P/N PU1605 and PU1605A) installed on specified Prestolite Models including ALE6406, ALE 6406R, ALE 8105A, ALE 8105S, ALE 8406, ALE 8406R, ALE 8408, ALE 8408R, ALH 5105, ALH 5105S, ALH 5106S, ALT 5101A, ALT 5101R, ALT 5102S, ALT 8403, ALT 8404, ALT 8404R, ALT 8404RS, ALT 8404LS, ALU 8403, ALU 8403R, ALU 8403RS, ALU 8403LS, ALX 6406, ALX 8403, ALX 8403R, ALX 8403RS, ALX 8403LS, ALY 6406, ALY 6406R, ALY 6407, ALY 6408, ALY 8402, ALY 8403, ALY 8403R, ALY 8403RS, ALY 8403LS, ALY 8405, ALY 8405R, ALY 8410, ALY 8410R, ALZ 8401, ALZ 8401R alternators used in various aircraft engines.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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