NTSB Identification: CHI82FA211
14 CFR Part 91: General Aviation
Accident occurred Sunday, June 06, 1982 in VANDALIA, OH
Probable Cause Approval Date: 06/06/1983
Aircraft: PIPER PA-30, registration: N7254Y
Injuries: 1 Uninjured.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

DURING DESCENT AT 215 MPH THE ACFT ENTERED VIOLENT BUFFETING. RECOVERY WAS INITIATED BY REDUCING POWER & THE ACFT LANDED WITHOUT ANY FURTHER INCIDENT. EXAMINATION REVEALED THE HORIZONTAL STABILATOR WAS PERMANENTLY BENT DOWNWARD ON BOTH SIDES. THE ACFT WAS MODIFIED WITH GAP SEALS ON 5/25/82 IAW STC SA516GL. EXAMINATION OF THE COUNTERBALANCE ARM ASSEMBLY SHOWED THAT TWO SMALL WEIGHTS (SLUGS) WERE USED TO OBTAIN A BALANCED CONDITION WHEN THE STC MODIFICATION WAS COMPLETED ON THE STABILATOR. THE STC CONTAINED A LIMITATION THAT IT SHOULD NOT BE INCORPORATED IN ANY ACFT HAVING OTHER APPROVED MODIFICATIONS UNLESS IT HAS BEEN DETERMINED THAT IT WILL NOT INTRODUCE ANY ADVERSE EFFECT UPON ACFT AIRWORTHINESS. THIS ACFT HAD 8 OTHER MODIFICATIONS. ON 7/10/82 THE OWNER OF THE STC ISSUED A SERVICE BULLETIN WHICH EFFECTIVELY REMOVED THE GAP SEALS ON ALL PA-30 & PA-39 TYPE.ACFT THAT HAD PREVIOUSLY BEEN MODIFIED.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

FLIGHT CONTROL,STABILATOR..IMPROPER

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

RUDDERVATOR..IMPROPER..PRODUCTION/DESIGN PERSONNEL

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

PERFORMANCE DATA..NOT ATTAINED..PRODUCTION/DESIGN PERSONNEL

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

MAINTENANCE,DESIGN CHANGE..INADEQUATE..PRODUCTION/DESIGN PERSONNEL

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

ACFT/EQUIP INADEQUATE,SUPPLEMENTAL TYPE CERT..MANUFACTURER

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