A-93-041

NTSB Safety Recommendation — Aviation

Recommendation text

THE NTSB RECOMMENDS THAT THE FEDERAL AVIATION ADMINISTRATION: REQUIRE THE BEECH AIRCRAFT CORPORATION TO AMEND PILOT OPERATING HANDBOOKS AND AIRPLANE FLIGHT MANUALS APPLICABLE TO MODELS 35, 35R, A35, AND B35, BY INCLUDING IN "EMERGENCY PROCEDURES" INFORMATION REGARDING POTENTIAL EMPENNAGE FLUTTER. THIS INFORMATION SHOULD INCLUDE THE IMMEDIATE OPERATIONAL AND POST-FLIGHT STRUCTURAL INSPECTION PROCEDURES TO BE FOLLOWED IN THE EVENT OF EXCESSIVE VIBRATION OR FLUTTER OF THE EMPENNAGE; A WARNING THAT FLUTTER IS SOMETIMES PRESAGED BY BUZZING, HUMMING, VIBRATION, OR SHAKING IN THE CONTROL SYSTEMS; AND THE NEED TO BALANCE THE RUDDERVATORS ANY TIME THEY ARE REPAIRED OR REPAINTED TO ENSURE THAT THE STATIC BALANCE REMAINS WITHIN SERVICE LIMITS.

In plain language (FlightFinder summary)

The Federal Aviation Administration is asked to require Beech Aircraft Corporation to update pilot handbooks and flight manuals for certain Beechcraft models (35, 35R, A35, B35) to include emergency procedures addressing potential tail flutter. The update must detail inspection steps after excessive vibration, a warning that control system buzzing may signal flutter, and the necessity of balancing ruddevators after repairs or repainting to maintain proper static balance.

This plain-language summary is written by FlightFinder to explain the recommendation above. It is not the official wording — the verbatim NTSB text is quoted above.

Details

StatusClosed - Acceptable Alternate Action
ModeAviation
ClosedApr 4, 1995
NTSB numberDEN92FA028
AddresseesFAA

External links

NTSB safety recommendations are advisory; addressees are not legally required to adopt them. Source: NTSB CAROL (public domain).