Is AD 97-26-02 a recurring Airworthiness Directive?

No — AD 97-26-02 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 97-26-02 apply to?

AD 97-26-02 applies to Eurocopter — models BO105 LS, BO105. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 97-26-02

one-time

Official AD 97-26-02 · FR doc 97-32720 · 1997-12-16 · airframe

Airworthiness Directives; Eurocopter Deutschland GmbH (ECD) Model BO-105A, BO-105C, BO-105S, BO-105LS A-1, and BO-105LS A-3 Helicopters and Eurocopter Canada Ltd. Model BO-105LS A-3 Helicopters

What this AD requires

This amendment adopts a new airworthiness directive (AD) that is applicable to Eurocopter Deutschland GmbH (ECD) (Eurocopter Deutschland) Model BO-105A, BO-105C, BO-105S, BO-105LS A-1, and BO- 105LS A-3 helicopters; and Eurocopter Canada Ltd. Model BO-105LS A-3 helicopters. This action requires visual inspections for cracks in the ribbed area of the main rotor mast flange (flange). This amendment is prompted by a report of an operator discovering a crack in the flange after experiencing in-flight vibrations. The actions specified in this AD are intended to detect cracks in the flange, which, if not detected, could result in failure of the flange and subsequent loss of control of the helicopter.

Which aircraft AD 97-26-02 applies to

MakesEurocopter

ModelsBO105 LS, BO105

Requires visual inspection (5-power or higher magnification) of the main rotor mast flange ribbed area for cracks, before further flight and thereafter at intervals not exceeding 100 hours TIS, per Eurocopter Deutschland ASB-BO105-10-110 dated Aug 27, 1997 or Eurocopter Canada ASB-BO105 LS-10-9 dated Sep 11, 1997 (BO105 LS), as applicable; cracked masts replaced with an airworthy main rotor mast. Special flight permits will not be issued.

Whether AD 97-26-02 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 97-26-02 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.