AD 2026-04-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
The BAT BUS SECT 2 circuit breaker (CB3062) on the standby power control unit (SPCU) tripping causes an unintended erroneous electrical ground signal to the smart ram air door actuators (SRADAs), which in turn causes both ram air deflector doors to extend (close), thus reducing cooling airflow to the air conditioning heat exchangers. The reduced airflow causes insufficient cooling of the hot bleed air, which causes both packs to supply excessively hot air to the cabin and flight deck.
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Required Actions
Revising the Operating Procedures section of the existing airplane flight manual (AFM) to provide the flightcrew with non-normal checklists if the BAT BUS SECT 2 circuit breaker in the SPCU trips.
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Compliance Time
Before further flight
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Affected Aircraft
The Boeing Company Model 737-8, 737-9, and 737-8200 airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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