AD 90-21-19
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 727-100 Series | Airworthiness Directives; BOEING Model 727 and 727-100 Series Airplanes |
| aircraft | The Boeing Company | 727-100C Series | Airworthiness Directives; BOEING Model 727 and 727-100 Series Airplanes |
| aircraft | The Boeing Company | 727 Series | Airworthiness Directives; BOEING Model 727 and 727-100 Series Airplanes |
| aircraft | The Boeing Company | 727C Series | Airworthiness Directives; BOEING Model 727 and 727-100 Series Airplanes |
Unsafe Condition
Inadvertent in-flight opening of the main deck cargo door due to insufficient latch lockpins or deficiencies in the cargo door warning annunciator system wiring, connectors, switches, or functional operation.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 5 days after the effective date, inspect the main deck cargo door latch lockpins. If fewer than 7 are installed, within 10 days install a cockpit warning placard, revise the AFM Limitations Section, verify door closure and latch alignment, and inspect wiring, connectors, switches, and functional operation of the warning system. Within 60 days, install six latch locking mechanisms per AEI Service Bulletin R-690 to terminate repetitive inspections and remove placards/AFM revisions.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 5 days, 10 days, 60 days after the effective date of this AD, and thereafter at intervals not to exceed 30 days.
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Affected Aircraft
Boeing Model 727 and 727-100 series airplanes equipped with main deck cargo doors installed per STC SA1368SO.
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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