Fire Protection - Engine Fire Shutoff Switches - Replacement
- Published
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- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of Boeing 787-8, 787-9, and 787-10 airplanes must inspect the serial numbers of EFSSs with part numbers 417000-104 and 417000-105 and replace any affected units or those lacking the specified inspection marking. Installation of affected EFSS parts is limited under this directive. All actions must be completed by the effective date of January 18, 2023.
Summary
The Federal Aviation Administration's Airworthiness Directive 2022-24-11 addresses all Boeing Model 787-8, 787-9, and 787-10 airplanes. It focuses on engine fire shutoff switches (EFSSs) that may contain foreign object debris introduced during rework, potentially compromising fire protection functions. The directive mandates identification and replacement of affected EFSS parts to ensure continued airworthiness and safety.
What changed
This new airworthiness directive requires operators to determine the serial numbers of left and right EFSSs with part numbers 417000-104 and 417000-105 and replace any units with affected serial numbers or those not marked with the required inspection record. It also restricts installation of affected EFSS parts under certain conditions to prevent unsafe operation. This AD introduces mandatory inspections and replacements to mitigate latent failures caused by foreign object debris.
Why it matters
This directive is critical for aviation professionals because it addresses a latent failure risk in engine fire shutoff switches that could prevent proper engine fire handle operation or cause uncommanded fuel shutoff. Failure to comply could result in uncontrolled engine fires or total loss of engine thrust, posing serious safety hazards. Operators, maintenance, and compliance teams must ensure affected parts are identified and replaced to maintain regulatory compliance and flight safety.
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