AD 91-09-15
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 767-200 Series | Airworthiness Directives; BOEING Model 767 Series Airplanes |
| aircraft | The Boeing Company | 767-300 Series | Airworthiness Directives; BOEING Model 767 Series Airplanes |
| aircraft | The Boeing Company | 767-300F Series | Airworthiness Directives; BOEING Model 767 Series Airplanes |
Unsafe Condition
False oil filter bypass indication or loss of oil quantity from failed pressure switches.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace the engine oil filter differential pressure switch within 60 days after the effective date or prior to accumulating 10,000 total service hours, whichever is later. Subsequent replacements must occur at intervals not exceeding 10,000 total service hours. Removed switches cannot be reinstalled.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 60 days after the effective date of this AD, or prior to the accumulation of 10,000 total service hours, whichever occurs later, and thereafter at intervals not to exceed 10,000 total service hours.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Boeing Model 767-200 Series, 767-300 Series, 767-300F Series airplanes equipped with engine oil filter differential pressure switches on JT9D-7R4 or PW4000 engines as listed in Boeing Service Bulletin 767-79-0008.
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.