AD 69-17-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 737-100 Series | Airworthiness Directives; BOEING 737 and MCDONNELL DOUGLAS DC-9 Airplanes |
| aircraft | The Boeing Company | 737-200 Series | Airworthiness Directives; BOEING 737 and MCDONNELL DOUGLAS DC-9 Airplanes |
| aircraft | The Boeing Company | 737-200C Series | Airworthiness Directives; BOEING 737 and MCDONNELL DOUGLAS DC-9 Airplanes |
| aircraft | The Boeing Company | 737-300 Series | Airworthiness Directives; BOEING 737 and MCDONNELL DOUGLAS DC-9 Airplanes |
| aircraft | The Boeing Company | 737-400 Series | Airworthiness Directives; BOEING 737 and MCDONNELL DOUGLAS DC-9 Airplanes |
| aircraft | The Boeing Company | 737-500 Series | Airworthiness Directives; BOEING 737 and MCDONNELL DOUGLAS DC-9 Airplanes |
| aircraft | The Boeing Company | 737-600 Series | Airworthiness Directives; BOEING 737 and MCDONNELL DOUGLAS DC-9 Airplanes |
| aircraft | The Boeing Company | 737-700 Series | Airworthiness Directives; BOEING 737 and MCDONNELL DOUGLAS DC-9 Airplanes |
| aircraft | The Boeing Company | 737-800 Series | Airworthiness Directives; BOEING 737 and MCDONNELL DOUGLAS DC-9 Airplanes |
| aircraft | The Boeing Company | DC-9-11 | Airworthiness Directives; BOEING 737 and MCDONNELL DOUGLAS DC-9 Airplanes |
Unsafe Condition
Failure of the second stage impeller blades in the AiResearch Model GTCP85-98D (DC-9) and GTCP85-129 (Boeing 737) Auxiliary Power Units (APU) could result in inability to use the APU as an alternate electric power source.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install a placard within 10 hours time in service after the effective date stating both main engine generators must be operative for takeoff, and restrict APU use to in-flight emergencies only. The placard may be removed after APU replacement with satisfactory impellers or modification per AiResearch Telegraphic Service Bulletins.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 10 hours time in service after the effective date of this Airworthiness Directive
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Affected Aircraft
MCDONNELL DOUGLAS DC-9 and BOEING 737 airplanes equipped with AiResearch Model GTCP85-98D APU (DC-9) or GTCP85-129 APU (Boeing 737), with serial numbers listed in AiResearch Telegraphic Bulletins 49A1761 (DC-9) or 49A1760 (Boeing 737) dated July 1, 1969, or later FAA approved revisions.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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