AD 74-10-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airesearch | The Boeing Company | Auxiliary Power Units | Airworthiness Directives; AIRESEARCH: Applies to Model TSCP 700-4B Auxiliary Power Units (APU) Installed in McDonnell Douglas Model DC-10 Aircraft |
| aircraft | Airesearch | The Boeing Company | DC-10-10 | Airworthiness Directives; AIRESEARCH: Applies to Model TSCP 700-4B Auxiliary Power Units (APU) Installed in McDonnell Douglas Model DC-10 Aircraft |
| aircraft | Airesearch | The Boeing Company | DC-10-10F | Airworthiness Directives; AIRESEARCH: Applies to Model TSCP 700-4B Auxiliary Power Units (APU) Installed in McDonnell Douglas Model DC-10 Aircraft |
| aircraft | Airesearch | The Boeing Company | DC-10-15 | Airworthiness Directives; AIRESEARCH: Applies to Model TSCP 700-4B Auxiliary Power Units (APU) Installed in McDonnell Douglas Model DC-10 Aircraft |
| aircraft | Airesearch | The Boeing Company | DC-10-30 | Airworthiness Directives; AIRESEARCH: Applies to Model TSCP 700-4B Auxiliary Power Units (APU) Installed in McDonnell Douglas Model DC-10 Aircraft |
| aircraft | Airesearch | The Boeing Company | DC-10-30F (KC-10A, KDC-10) | Airworthiness Directives; AIRESEARCH: Applies to Model TSCP 700-4B Auxiliary Power Units (APU) Installed in McDonnell Douglas Model DC-10 Aircraft |
| aircraft | Airesearch | The Boeing Company | DC-10-40 | Airworthiness Directives; AIRESEARCH: Applies to Model TSCP 700-4B Auxiliary Power Units (APU) Installed in McDonnell Douglas Model DC-10 Aircraft |
| aircraft | Airesearch | The Boeing Company | DC-10-40F | Airworthiness Directives; AIRESEARCH: Applies to Model TSCP 700-4B Auxiliary Power Units (APU) Installed in McDonnell Douglas Model DC-10 Aircraft |
Unsafe Condition
Fatigue cracks in the fuel control differential pressure regulator body can allow fuel to leak into the APU compartment.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install a placard prohibiting in-flight APU operation within 25 hours. Remove the restriction after completing inspections/modifications per AiResearch Service Bulletin 969900-49-3635. Inspect the regulator body every 3000 APU cycles and replace if cracks are found.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 25 hours additional time in service after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
AIRESEARCH Model TSCP 700-4B APUs installed in McDonnell Douglas Model DC-10 aircraft
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
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.