- Date
- September 22, 1971
- Place
- Chicago, IL · CHICAGO, IL
- Injuries
- 2 serious
- Damage
- Substantial damage
- Phase of flight
- Enroute
- Aircraft
- N4033GBell 47G-4A
- Status
- Completed · report May 2, 1973
- Report
- Brief approved by the director
- Case key
- 164567
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 ---------------------------------------------------------------------------------------------------------------------------- 3-4572 71/9/22 CHICAGO,ILL BELL 47G-4A CR- 0 2 0 MISCELLANEOUS COMMERCIAL, FL.INSTR., TIME - 0955 N4033G PX- 0 0 0 POLICE PATROL AGE 40, 952 TOTAL HOURS, DAMAGE-SUBSTANTIAL OT- 0 0 0 ALL IN TYPE, NOT INSTRUMENT RATED. DEPARTURE POINT INTENDED DESTINATION CHICAGO,ILL LOCAL TYPE OF ACCIDENT PHASE OF OPERATION ENGINE FAILURE OR MALFUNCTION IN FLIGHT: NORMAL CRUISE HARD LANDING LANDING: POWER-OFF AUTOROTATIVE LANDING PROBABLE CAUSE(S) POWERPLANT - LUBRICATING SYSTEM: REGULATORS MISCELLANEOUS ACTS,CONDITIONS - OIL EXHAUSTION-ENGINE LUBRICATION SYSTEM FACTOR(S) PERSONNEL - PRODUCTION-DESIGN-PERSONNEL: POOR/INADEQUATE DESIGN COMPLETE POWER LOSS - COMPLETE ENGINE FAILURE/FLAMEOUT-1 ENGINE EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND REMARKS- PRESS ADJ SCREW CAME OUT.
Aircraft
- Registration
- N4033G
- Reported as
- Bell 47G-4A
- Category
- Helicopter
- Engine
- reciprocating
- Damage
- Substantial damage
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 N4033G · 1
Matched to the same aircraft by N-number and date.