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Airworthiness Directive 2021-03-17

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Official AD 2021-03-17 · FR doc 2021-03574 · 2021-02-23 · 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 airplanes. This AD was prompted by a report of smoke and signs of an overheating condition from the emergency light battery (ELB) due to excessive corrosion surrounding the internal lead acid batteries, which caused an electrical short circuit that led to the smoke and overheating condition. This AD requires an inspection to determine the last replacement date of the ELB, and replacement if necessary. This AD also requires the incorporation of a new maintenance task into the existing maintenance or inspection program. The FAA is issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2021-03-17 applies to

MakesBombardier, Inc.
ModelsBD-700-1A10, BD-700
Serial-conditional — narrows to serials 9002–9002, 9003–9003, 9011–9011, 9016–9016, 9020–9020, 9022–9025, 9029–9029, 9031–9031, 9032–9032, 9036–9036, 9039–9044, 9046–9058, 9060–9065, 9067–9081, 9083–9106, 9108–9122, 9124–9126, 9128–9128, 9129–9129, 9133–9133, 9134–9134, 9136–9139, 9141–9148, 9150–9150, 9151–9151, 9153–9153, 9159–9159, 9162–9162, 9163–9163, 9165–9165, 9169–9169.

Whether AD 2021-03-17 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 2021-03-17 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.