AD 2021-01-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
latent failures of the equipment cooling system and low pressure environmental control system, which, in combination with a cargo fire event, could result in smoke in the flight deck and/or main cabin, and possible loss of aircraft control.
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Required Actions
repetitive testing to verify correct operation of the smoke clearance mode of the equipment cooling system and low pressure environmental control system, and corrective actions if necessary; installing new relays and changing the wiring to the environmental control system, and accomplishing certain concurrent actions.
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Compliance Time
Before further flight
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Affected Aircraft
The Boeing Company Model 737-700 series airplanes having line numbers (L/Ns) 481, 545, 684, 979, 1089, 1211, and 1223.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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