- Date
- May 25, 1972
- Place
- Detroit, MI · DETROIT, MI
- Injuries
- 2 uninjured
- Damage
- Substantial damage
- Phase of flight
- Enroute
- Aircraft
- N7979JBell 47G-5
- Status
- Completed · report February 14, 1973
- Report
- Brief approved by the director
- Case key
- 167038
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 ---------------------------------------------------------------------------------------------------------------------------- 3-1897 72/5/25 DETROIT,MICH BELL 47G-5 CR- 0 0 2 MISCELLANEOUS COMMERCIAL, AGE 33, 900 TIME - 2230 N7979J PX- 0 0 0 POLICE PATROL TOTAL HOURS, 190 IN TYPE, DAMAGE-SUBSTANTIAL OT- 0 0 0 NOT INSTRUMENT RATED. NAME OF AIRPORT - DETROIT CITY DEPARTURE POINT INTENDED DESTINATION DETROIT,MICH LOCAL TYPE OF ACCIDENT PHASE OF OPERATION PROPELLER/ROTOR FAILURE: TAIL ROTOR IN FLIGHT: NORMAL CRUISE HARD LANDING LANDING: POWER-OFF AUTOROTATIVE LANDING PROBABLE CAUSE(S) ROTORCRAFT - TRANSMISSION ROTOR DRIVE SYSTEM: TAIL ROTOR GEAR BOX MISCELLANEOUS ACTS,CONDITIONS - IMPROPERLY SECURED MISCELLANEOUS ACTS,CONDITIONS - IMPROPERLY INSTALLED PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: INADEQUATE MAINTENANCE AND INSPECTION MISCELLANEOUS - EVASIVE MANEUVER TO AVOID COLLISION EMERGENCY CIRCUMSTANCES - FORCED LANDING ON AIRPORT/SEAPLANE BASE/HELIPT. REMARKS- T/R SYS FAILED DUE OMISSION OF RETAINING NUT ON PITCH CHNG MECHANISM. HAD TO AVOID PARKED ACFT.
Aircraft
- Registration
- N7979J
- Reported as
- Bell 47G-5
- Category
- Helicopter
- Engine
- reciprocating
- Damage
- Substantial damage
- Airport
- Detroit City
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.
Other investigations on N7979J · 1
Matched to the same aircraft by N-number and date.