- Date
- April 23, 1969
- Place
- Lodge Grass, MT · LODGE GRASS, MT
- Injuries
- 1 uninjured
- Damage
- Substantial damage
- Phase of flight
- Uncontrolled descent
- Aircraft
- N2186UBrantly B-2B
- Status
- Completed · report June 24, 1969
- Report
- Brief approved by the director
- Case key
- 189624
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 ---------------------------------------------------------------------------------------------------------------------------- 3-1142 69/4/23 LODGE GRASS,MONT BRANTLY B-2B CR- 0 0 1 INSTRUCTIONAL STUDENT, AGE 44, 58 TOTAL TIME - 1855 N2186U PX- 0 0 0 TRAINING HOURS, ALL IN TYPE, NOT DAMAGE-SUBSTANTIAL OT- 0 0 0 INSTRUMENT RATED. TYPE OF ACCIDENT PHASE OF OPERATION COLLISION WITH GROUND/WATER: UNCONTROLLED IN FLIGHT: UNCONTROLLED DESCENT PROBABLE CAUSE(S) PILOT IN COMMAND - FAILED TO MAINTAIN ADEQUATE ROTOR R.P.M. FACTOR(S) WEATHER - DOWNDRAFT,UPDRAFTS WEATHER BRIEFING - NO RECORD OF BRIEFING RECEIVED WEATHER FORECAST - UNKNOWN/NOT REPORTED SKY CONDITION CEILING AT ACCIDENT SITE CLEAR UNLIMITED VISIBILITY AT ACCIDENT SITE PRECIPITATION AT ACCIDENT SITE 5 OR OVER(UNLIMITED) NONE OBSTRUCTIONS TO VISION AT ACCIDENT SITE TEMPERATURE-F NONE 65 WIND DIRECTION-DEGREES WIND VELOCITY-KNOTS 180 15 TYPE OF WEATHER CONDITIONS TYPE OF FLIGHT PLAN VFR NONE REMARKS- DOWNDRAFTS ON DOWNWIND SIDE OF 50 FT HIGH TREES.WINDS 15-20 KTS.
Aircraft
- Registration
- N2186U
- Reported as
- Brantly B-2B
- 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.