# NTSB MIA88LA198: Hughes 369D, N1109P, Horn Lake, MS, June 19, 1988

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: June 19, 1988, 16:00 local (21:00 UTC)
- Place: Horn Lake, MS
- Coordinates: 34.950744, -90.029663 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=34.9507&lon=-90.0297&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report July 3, 1989
- Report: Approved by Office Director
- NTSB case key (mKey): 32194
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MIA88LA198
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/32194/pdf
- Page: https://openairdocs.org/ntsb/MIA88LA198

## Sequence of events

In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf).

- Loss of engine power(total) - mech failure/malf, cruise - normal
  - fluid,fuel grade - other (contributing factor)
  - weather condition - temperature extremes (contributing factor)
  - fuel system,pump - worn (cause)
  - fuel system,pump - output low (cause)
- Forced landing, descent - emergency
  - autorotation
- Hard landing, landing - flare/touchdown
  - terrain condition - high vegetation (contributing factor)

## Analysis

BFR TKOF, THE HELICOPTER WAS SVCD WITH 100LL FUEL (AN APPROVED ALTN FUEL IF THE BOOST PUMP IS USED IN FLT). DRG FLT, THEENG LOST PWR. AN AUTOROTATION WAS MADE IN TALL VEGETATION, BUT DRG THE LNDG, THE MAIN ROTOR BLADES SEVERED THE TAIL BOOM. AN INSPN OF THE FUEL SYS REVEALED NO EVIDENCE OF CONTAMINATION. THE PNEUMATIC SYS WAS PRESSURE-TESTED & NO LEAKS WERE FND. POST-ACDNT ATMTS TO START THE ENG WERE UNSUCCESSFUL UNTIL THE FUEL SYS WAS PURGED OF AIR. IT THEN STARTED & OPERATED NORMALLY FOR ABOUT 5 MIN, BUT THE FUEL PUMP WAS FOUND TO BE UNSERVICEABLE WITH WORN SEALS & BEARINGS. A BENCH CHECK SHOWED THE FUEL PUMP HAD A FLOW RATE OF 700 PPH AT 600 PSI, THE PUMP SHOULD HAVE HAD A MIN FLOW RATE OF 1269 PPH. ALSO, THE POWER TURBINE GOVERNOR WAS FND TO BE SLIGHTLY OUT OF ADJUSTMENT & A FUEL NOZZLE HAD EXCESSIVE STREAKS & VOIDS IN ITS SPRAY PATTERN. PERSONNEL AT THE MANUFACTURER BELIEVED THE ENG MAY HAVE LOST PWR DUE TO A COMBINATION OF A WORN FUEL PUMP & THE USE OF 100LL FUEL ON A 94 DEG DAY OR FROM VAPOR LOCK.

## Aircraft

- Registration: [N1109P](https://openairdocs.org/deregistered/N1109P-2000-11-03), registration cancelled 2000-11-03, S/N 1100849D (OpenAirDocs)
- Reported make and model: HUGHES 369D
- Registry model: [Hughes Helicopters HUGHES 369D](https://openairdocs.org/model/hughes-helicopters-hughes-369d) (registry code 4470706) (OpenAirDocs)
- Category: Helicopter
- Serial number: 1100849D
- Airframe hours: 2890
- Engines: ALLISON 250-C20B 375 horsepower turbo shaft
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Denver Helicopter
- Registered owner: Whirleybirds Leasing Co. Viii
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, April 22, 1988, 200 hours before
- Departed: M41, HOLLY SPRINGS, MS
- Destination: JBR, JONESBORO, AR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 39; commercial; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; flight hours: 6,000 total

## Weather

- Conditions: Visual (VMC), Day
- Wind: 170° at 8 knots
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 93 °F, dew point 61 °F
- Altimeter: 30.00 inHg
- Observed at: MEM, 7 nm away

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 19880619040699A](https://openairdocs.org/incident/19880619040699A), Jun 19, 1988: Hughes 369D, Horn Lake, MS, Substantial damage. Engine quit shortly after takeoff. Chopped tailboom landing. Worn fuel pump 100LL avgas hot day possible factors.

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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