- Date
- August 21, 1970
- Place
- Manitowish, WI · MANITOWISH, WI
- Injuries
- 1 uninjured
- Damage
- Substantial damage
- Phase of flight
- Enroute
- Aircraft
- N4252ABell 47D1
- Status
- Completed · report October 5, 1971
- Report
- Brief approved by the director
- Case key
- 107802
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 ---------------------------------------------------------------------------------------------------------------------------- 3-4481 70/8/21 MANITOWISH,WIS BELL 47D1 CR- 0 0 1 COMMERCIAL COMMERCIAL, FL.INSTR., TIME - 0700 N4252A PX- 0 0 0 ASSOC CROP CTL ACTIVITY AGE 36, 6044 TOTAL HOURS, DAMAGE-SUBSTANTIAL OT- 0 0 0 25 IN TYPE, NOT INSTRUMENT RATED. DEPARTURE POINT INTENDED DESTINATION MANITOWISH WATERS LOCAL TYPE OF ACCIDENT PHASE OF OPERATION COLLIDED WITH: TREES IN FLIGHT: OTHER PROBABLE CAUSE(S) PILOT IN COMMAND - INADEQUATE PREFLIGHT PREPARATION AND/OR PLANNING PILOT IN COMMAND - SELECTED UNSUITABLE TERRAIN PILOT IN COMMAND - FAILED TO MAINTAIN ADEQUATE ROTOR R.P.M. TERRAIN - HIGH OBSTRUCTIONS SPECIAL DATA TOTAL HOURS IN CROP CONTROL - 900 KIND OF OPERATION - DEFOLIATION (LIQUID) KIND OF CROP - FOREST-TREES TYPE OF CHEMICAL USED - LIQUID CHEMICAL-NONTOXIC PILOT' S SEAT BELT -UNKNOWN/NOT REPORTED GLOVES - NOT USED GOGGLES - NOT USED CRASH HELMET - AVAILABLE USED COCKPIT CRASHPAD - NOT INSTALLED CRASH BAR - NOT INSTALLED TANK/HOPPER-LOCATION - SIDES TERRAIN-TYPE -LEVEL,FLAT ELEVATION-AREA BEING TREATED-FEET - 900 SWATH RUN-HOW FLOWN - UPWIND REMARKS- MADE VER LFT OFF TO TREE TOP LVL LOST ROTOR RPM DURG ATMT ATTAIN TRANSLATIONAL LFT.SETTLD IN TREES
Aircraft
- Registration
- N4252A
- Reported as
- Bell 47D1
- Category
- Helicopter
- Engine
- reciprocating
- Damage
- Substantial damage
N4252ARegistration cancelled Mar 15, 2017 · Bell 47D1Airframe modelBell 47D1Engine modelLycoming VO-435 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.
Other investigations on N4252A · 1
Matched to the same aircraft by N-number and date.