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Airworthiness Directive 2025-14-51

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Official AD 2025-14-51 · FR doc 2026-03055 · 2026-02-17 · airframe

Airworthiness Directives; Bombardier Inc. Airplanes

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for certain Bombardier Inc. Model BD-700-1A10 and BD-700-1A11 airplanes. The FAA previously sent this AD to all known U.S. owners and operators of these airplanes. This AD was prompted by discrepancies in the locking features on certain network interfaces. This AD requires installing locking features on certain network interfaces to prevent unapproved access to these network interfaces. The FAA is issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2025-14-51 applies to

MakesBombardier Inc.
ModelsBD-700-1A10, BD-700-1A11, BD-700
Serial-conditional — narrows to serials 9381–9381, 9432–9861, 9863–9878, 60001–61999, 9386–9386, 9401–9401, 9445–9862, 9868–9879, 60007–61999.

BD-700-1A10 airplanes: serial numbers 9381, 9432 through 9861 inclusive, 9863 through 9878 inclusive, and 60001 through 61999 inclusive. BD-700-1A11 airplanes: serial numbers 9386, 9401, 9445 through 9862 inclusive, 9868 through 9879 inclusive, and 60007 through 61999 inclusive.

Whether AD 2025-14-51 actually applies to your aircraft (by serial and installed parts) and whether it’s already complied with comes from that aircraft’s records.

How AD compliance is recorded

A valid compliance record (14 CFR 43.9) states:

Method of compliance — The specific action taken (inspected, replaced, modified) and to what revision.
Date — When the work was done.
Aircraft time — Total time in service / tach at compliance — how recurring next-due is computed.
Signature & certificate — The A&P/IA who returned it to service, with certificate number.
Is AD 2025-14-51 complied with on your aircraft?

Tailplate reads a tail number’s logbooks and matches every applicable AD — including this one — to its compliance evidence, with recurring next-due dates computed.

Look up a tail number →Read the full directive (Federal Register)

Applicability is derived from the FAA directive corpus and is advisory, not a legal airworthiness determination. Compliance is established only from an aircraft’s actual records.