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Airworthiness Directive 2000-04-10

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Official AD 2000-04-10 · FR doc 00-4262 · 2000-02-23 · propeller

Airworthiness Directives; Hoffmann Propeller Co. HO27( ) and HO4/27 Series Propellers

What this AD requires

This amendment adopts a new airworthiness directive (AD) that is applicable to Hoffmann Propeller Co. HO27( ) and HO4/27 series propellers. This action requires installing improved propeller mounting bolts to a higher torque value, operating the airplane for one flight, checking the torque, and retorquing, as required, to the correct torque value. This amendment is prompted by reports of insufficient torque of propeller mounting bolts due to operating conditions, loads, and environmental conditions such as humidity and temperature. The actions specified in this AD are intended to prevent propeller mounting bolt failure, which could result in propeller separation and loss of control of the airplane.

Which aircraft AD 2000-04-10 applies to

MakesHoffmann Propeller Co.
ModelsHO27, HO4/27
Part-conditional — FP20-147.

Applies only to Hoffmann HO27() and HO4/27 series propellers with propeller mounting bolts P/N FP20-147()()() installed (parentheses denote optional additional letters in the designation). These propellers are installed on, but not limited to, Textron Lycoming O-360 and O-540 series and Teledyne Continental O-470 series reciprocating-engine-powered airplanes manufactured by Aeronca, Bellanca, Cessna, DeHavilland, Piper, Socata, Rallye, Stinson, and Varga. AD requires replacement with improved bolts P/N FP20-147()()()V.

Whether AD 2000-04-10 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 2000-04-10 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.