AD 74-12-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | Airesearch | A300 B2-1A | Airworthiness Directives; AIRESEARCH MANUFACTURING COMPANY of ARIZONA: Applies to Model TSCP700-5 Auxiliary Power Units |
| aircraft | Airbus | Airesearch | A300 B2-1C | Airworthiness Directives; AIRESEARCH MANUFACTURING COMPANY of ARIZONA: Applies to Model TSCP700-5 Auxiliary Power Units |
| aircraft | Airbus | Airesearch | A300 B2-203 | Airworthiness Directives; AIRESEARCH MANUFACTURING COMPANY of ARIZONA: Applies to Model TSCP700-5 Auxiliary Power Units |
| aircraft | Airbus | Airesearch | A300 B2K-3C | Airworthiness Directives; AIRESEARCH MANUFACTURING COMPANY of ARIZONA: Applies to Model TSCP700-5 Auxiliary Power Units |
| aircraft | Airbus | Airesearch | A300 B4-103 | Airworthiness Directives; AIRESEARCH MANUFACTURING COMPANY of ARIZONA: Applies to Model TSCP700-5 Auxiliary Power Units |
| aircraft | Airbus | Airesearch | A300 B4-203 | Airworthiness Directives; AIRESEARCH MANUFACTURING COMPANY of ARIZONA: Applies to Model TSCP700-5 Auxiliary Power Units |
| aircraft | Airbus | Airesearch | A300 B4-2C | Airworthiness Directives; AIRESEARCH MANUFACTURING COMPANY of ARIZONA: Applies to Model TSCP700-5 Auxiliary Power Units |
| aircraft | Airbus | Airesearch | A300 B4-601 | Airworthiness Directives; AIRESEARCH MANUFACTURING COMPANY of ARIZONA: Applies to Model TSCP700-5 Auxiliary Power Units |
| aircraft | Airbus | Airesearch | A300 B4-603 | Airworthiness Directives; AIRESEARCH MANUFACTURING COMPANY of ARIZONA: Applies to Model TSCP700-5 Auxiliary Power Units |
| aircraft | Airbus | Airesearch | A300 B4-605R | Airworthiness Directives; AIRESEARCH MANUFACTURING COMPANY of ARIZONA: Applies to Model TSCP700-5 Auxiliary Power Units |
Unsafe Condition
Cracks in the fuel control differential pressure regulator housing (P/N 977320-1 or -2) and failure to meet minimum dimensions could result in fuel control failure, leading to APU malfunction or shutdown.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the fuel control differential pressure regulator housing for cracks and minimum dimensions per AiResearch Alert Service Bulletin 969900-49-A3644. Re-work or replace housings as necessary. Modify fuel control assembly per the service bulletin and re-identify parts. Perform recurring inspections every 3000 operating cycles unless replaced with P/N 977656-1.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Prior to any further in-flight operation for initial inspections; before exceeding 1500 operating cycles for modifications; and within 3000 operating cycles after modification with recurring intervals not exceeding 3000 operating cycles.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
AIRESEARCH MANUFACTURING COMPANY of ARIZONA Model TSCP700-5 Auxiliary Power Units installed in Airbus Industries Model A300B 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
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