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Safety record
NTSB · Oct 15, 2026 · FAA ADs · Oct 20, 2026 · SDRs · Oct 16, 2026
NTSB events (1)
Accident · substantial damage
Jun 18, 1986 · Galveston, TX
THE PLT RPRTD THAT WHILE APCHG AN OIL DRILLING PLATFORM FOR A LNDG, HE OBSERVED THE MAIN ROTOR BLADES GO OUT OF TRACK ABOUT 8 TO 10 INCHES. HE ALSO RPRTD THE HELICOPTER DEVELOPED A 1:1 VERTICAL VIBRATION. DRG THE LNDG, THE HELICOPTER ENTERED INTO GROUND RESONANCE & THE PLT IMMEDIATELY SHUT DOWN BOTH ENGINES. AN EXAM OF THE HELICOPTER REVEALED THE LEFT FORWARD TRANSMISSION SUPPORT BAR (TSB) WAS…
These match the airframe or engine model. Whether each one applies, and whether it's been complied with, depends on serial numbers, equipment and logbook entries. Applicability must be confirmed by a mechanic against the aircraft's records.
No ADs published since 1998 matched this airframe or engine model.
AI-extracted — verify against original. Matched from each AD's applicability section; ADs replaced by a later AD are left out.
Service Difficulty Reports (5)
Reports of failures and defects that operators and repair stations sent to the FAA since 1995. A report describes one finding; it is not an accident.
Main rotor drive · coupling · failedApr 25, 1995
PILOT DETECTED A HUM AND VIBRATION FOR APPROXIMATELY ONE MINUTE. FOLLOWED BY A BANG AND LOSS OF POWER ON #2 ENGINE. FOUND #2 FLEX COUPLING AT THE TRANSMISSION DESTROYED. SCRAPPED COUPLING AND REPLACED WITH SERVICEABLE PART--RETURNED AIRCRAFT TO SERVICE.
From FAA Service Difficulty Reports; matched by N-number and serial number.
Engine · gearshaft · spalledApr 7, 1995
ENGINE REMOVED DUE TO MAIN ENGINE DRIVESHAFT FAILURE. UPON INSPECTION OF GEARBOX PARTS NOTED THE FOLLOWING: SPALLING ON GEAR TEETH OF BOTH GEARSHAFTS. INSTALLED NEW GEARSHAFT. SEE MMIR #4704 FOR OTHER GEARSHAFT INFORMATION.
From FAA Service Difficulty Reports; matched by N-number and serial number.
Engine · gearshaft · spalledApr 7, 1995
ENGINE REMOVED DUE TO MAIN ENGINE DRIVESHAFT FAILURE. UPON INSPECTION OF GEARBOX PARTS NOTED THE FOLLOWING: SPALLING ON GEARTEETH OF BOTH GEARSHAFTS. INSTALLED NEW GEARSHAFT. SEE MMIR #4703 FOR OTHER GEARSHAFT INFORMATION.
From FAA Service Difficulty Reports; matched by N-number and serial number.
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Main rotor drive · disk coupling · failedFeb 27, 1995
PILOT DETECTED A HUM AND VIBRATION FOR APPROXIMATELY ONE MINUTE, FOLLOWED BY A BANG AND LOSS OF POWER ON NR 2 ENGINE. FOUND THE NR 2 FLEX COUPLING AT THE TRANSMISSION DESTROYED. CHAPTER 63-20-40, PAGE 6, FIGURE 3, ITEM 345.
From FAA Service Difficulty Reports; matched by N-number and serial number.
Main rotor drive · bolts · shearedFeb 23, 1995
IN-FLIGHT AT CRUISE, ACFT N5796T EXPERIENCED A SHATTERING OF THE NR 2 ENGINE TO C-BOX DISC COUPLING. THE 3 BOLTS ATTACHING THE DISC COUPLING TO THE C-BOX FLANGE WERE SEVERED AT THE COTTER PIN HOLES. CONTROL NR 95-005-6310.
From FAA Service Difficulty Reports; matched by N-number and serial number.