- Date
- June 28, 1971
- Place
- Chicago, IL · CHICAGO, IL
- Injuries
- 2 uninjured
- Damage
- Substantial damage
- Phase of flight
- Enroute
- Aircraft
- N4033GBell 47G-4A
- Status
- Completed · report November 29, 1971
- Report
- Brief approved by the director
- Case key
- 161157
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 ---------------------------------------------------------------------------------------------------------------------------- 3-0505 71/6/28 CHICAGO,ILL BELL 47G-4A CR- 0 0 1 MISCELLANEOUS COMMERCIAL, AGE 41, 644 TIME - 0940 N4033G PX- 0 0 1 POLICE PATROL TOTAL HOURS, ALL IN TYPE, DAMAGE-SUBSTANTIAL OT- 0 0 0 NOT INSTRUMENT RATED. DEPARTURE POINT INTENDED DESTINATION MIDWAY ARPT,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 - ENGINE STRUCTURE: VALVE ASSEMBLIES MISCELLANEOUS ACTS,CONDITIONS - STICKING PILOT IN COMMAND - MISJUDGED SPEED AND ALTITUDE FACTOR(S) TERRAIN - OTHER PARTIAL POWER LOSS - PARTIAL LOSS OF POWER - 1 ENGINE EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND REMARKS- EX VALVE NR 6 CYL STICKING,SET TO MFG SPECS.LYCOMING ENGINEERING CHANGE ISSUED 6/30/71 COVERS.
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.