- Date
- October 22, 1975
- Place
- Conshocken, PA · CONSHOCKEN, PA
- Injuries
- 3 uninjured
- Damage
- Substantial damage
- Phase of flight
- Enroute
- Aircraft
- N3939BBell 47J-2
- Status
- Completed · report January 18, 1976
- Report
- Brief approved by the director
- FAA report
- 19751022041339A
- Case key
- 151482
From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.
On this page
NTSB brief
NTSB’s brief of the accident, as it was printed: the coded facts, with the probable cause and factors.
---------------------------------------------------------------------------------------------------------------------------- FILE DATE LOCATION AIRCRAFT DATA INJURIES FLIGHT PILOT DATA F S M/N PURPOSE ---------------------------------------------------------------------------------------------------------------------------- 3-3781 75/10/22 CONSHOCKEN,PA BELL 47J-2 CR- 0 0 1 MISCELLANEOUS COMMERCIAL, FL.INSTR., TIME - 1732 N3939B PX- 0 0 2 HIGHWAY TRAFFIC ADVISORY AGE 28, 4506 TOTAL HOURS, DAMAGE-SUBSTANTIAL OT- 0 0 0 752 IN TYPE, INSTRUMENT RATED. DEPARTURE POINT INTENDED DESTINATION PHILADELPHIA,PA LOCAL TYPE OF ACCIDENT PHASE OF OPERATION ENGINE FAILURE OR MALFUNCTION IN FLIGHT: NORMAL CRUISE COLLISION WITH GROUND/WATER: CONTROLLED LANDING: POWER-OFF AUTOROTATIVE LANDING PROBABLE CAUSE(S) POWERPLANT - ENGINE STRUCTURE: MASTER AND CONNECTING RODS MISCELLANEOUS ACTS,CONDITIONS - FATIGUE FRACTURE MISCELLANEOUS ACTS,CONDITIONS - OIL EXHAUSTION-ENGINE LUBRICATION SYSTEM FACTOR(S) TERRAIN - ROUGH/UNEVEN COMPLETE POWER LOSS - COMPLETE ENGINE FAILURE/FLAMEOUT-1 ENGINE EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND REMARKS- NR 5 CONNECTING ROD (P/N LW-13422) FATIGUE FRACTURED AND BROKE A HOLE IN CRANKCASE.DRAINED ENG OIL
Aircraft
- Registration
- N3939B
- Reported as
- Bell 47J-2
- Category
- Helicopter
- Engine
- reciprocating
- Damage
- Substantial damage
N3939BRegistration cancelled Apr 5, 2018 · Bell 47J-2Airframe modelBell 47J-2Engine modelLycoming VO-540 series
Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.
FAA reports on this event · 1
The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.
Other investigations on N3939B · 1
Matched to the same aircraft by N-number and date.