# NTSB LAX72AL018: Hiller Acft UH12L4, N90486, Grnd Canyon, AZ, September 1, 1971

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Closed
- Date: September 1, 1971
- Place: Grnd Canyon, AZ · GRND CANYON, AZ
- Location: 36.0544° N, 112.1393° W: Placed by OpenAirDocs: center of Grand Canyon, AZ, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=36.0544&lon=-112.1393&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor, 3 uninjured
- Status: Completed, report May 23, 1972
- Report: Brief approved by the director
- Safety recommendations: Yes
- NTSB case key (mKey): 79867
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX72AL018
- Page: https://openairdocs.org/ntsb/LAX72AL018

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-3835   71/9/1    GRND CANYON,ARIZ    HILLER ACFT UH12L4  CR-  0  0  1  COMMERCIAL                COMMERCIAL, AGE 25, 2140
        TIME - 0945                    N90486              PX-  0  0  3  CTR PASSG-D               TOTAL HOURS, 32 IN TYPE,
                                       DAMAGE-DESTROYED    OT-  0  0  0                            NOT INSTRUMENT RATED.
        NAME OF AIRPORT - GRAND CANYON
        DEPARTURE POINT             INTENDED DESTINATION
          GRAND CANYON,ARIZ           LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLISION WITH GROUND/WATER: CONTROLLED                  TAKEOFF: INITIAL CLIMB
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - FAILED TO MAINTAIN ADEQUATE ROTOR R.P.M.
        FACTOR(S)
           WEATHER - HIGH DENSITY ALTITUDE
        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                                                      72
        WIND DIRECTION-DEGREES                                   WIND VELOCITY-KNOTS
          220                                                       4
        TYPE OF WEATHER CONDITIONS                               TYPE OF FLIGHT PLAN
          VFR                                                      NONE
         FIRE AFTER IMPACT
        REMARKS- DSTY ALT 8900,DURG TKOF PLT LOST ROTOR RPM,R SKID BROKE OFF,ACFT ROLLED OVER,FIRE BROKE OUT.
```

## Aircraft

- Registration: [N90486](https://openairdocs.org/deregistered/N90486-2017-02-04), registration cancelled 2017-02-04, S/N 2532, built 1966 (OpenAirDocs)
- Reported make and model: HILLER ACFT UH12L4
- Registry model: [Hiller UH-12L4](https://openairdocs.org/model/hiller-uh-12l4) (registry code 4360128) (OpenAirDocs)
- Registry engine: [Lycoming VO-540 series](https://openairdocs.org/engine/lycoming-vo-540-series) (registry code 41534, reciprocating) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: Destroyed
- Airport: Grand Canyon

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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