AD 70-03-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airesearch | Kelowna Flightcraft R & D Ltd. | Auxiliary Power Units | Airworthiness Directives; AiResearch: Applicable To Operators of Aircraft With AiResearch Model GTP30-141 Auxiliary Power Units |
| aircraft | Airesearch | Kelowna Flightcraft R & D Ltd. | 240 Series | Airworthiness Directives; AiResearch: Applicable To Operators of Aircraft With AiResearch Model GTP30-141 Auxiliary Power Units |
| aircraft | Airesearch | Kelowna Flightcraft R & D Ltd. | 340 | Airworthiness Directives; AiResearch: Applicable To Operators of Aircraft With AiResearch Model GTP30-141 Auxiliary Power Units |
| aircraft | Airesearch | Kelowna Flightcraft R & D Ltd. | 440 | Airworthiness Directives; AiResearch: Applicable To Operators of Aircraft With AiResearch Model GTP30-141 Auxiliary Power Units |
Unsafe Condition
Failure of the AiResearch Model GTP30-141 Auxiliary Power Unit (APU) in flight due to uncommanded shutdown or inability to restart, which could result in loss of electrical power and pressurization.
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Required Actions
Install a placard in full view of the pilot with specific operational instructions. The placard must state: 'Operation of the APU is prohibited in flight, except in emergency. Operate the APU at no load for at least one minute before shutdown.' Remove the placard only after replacing the APU with a series 4 or Change 5 modification per AiResearch Telegraphic Service Bulletin No. 49-A1838 or later FAA-approved revisions.
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Compliance Time
Within ten (10) hours time in service
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Affected Aircraft
AiResearch Model GTP30-141 Auxiliary Power Units installed on Convair 600/640 aircraft listed in AiResearch Telegraphic Bulletin No. 49-A1838 dated January 17, 1970, or later FAA-approved revisions.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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