# NTSB CHI88DER03: Cessna 172K, N7499G, Mora, MN, June 17, 1988

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Final report
- Date: June 16, 1988, 22:30 local (Jun 17, 1988, 03:30 UTC)
- Place: Mora, MN
- Coordinates: 45.870483, -93.289543 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=45.8705&lon=-93.2895&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 4 uninjured
- Status: Completed, report November 28, 1989
- Report: Approved by Office Director
- NTSB case key (mKey): 13888
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI88DER03
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/13888/pdf
- Page: https://openairdocs.org/ntsb/CHI88DER03

## 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, descent - normal
  - ignition system,magneto - failure,partial (cause)
  - ignition system,magneto - contamination (contributing factor)
  - maneuver - performed
  - ignition system,magneto - inoperative (cause)
- Forced landing, descent - emergency
- In flight collision with object, landing - flare/touchdown
  - light condition - dark night (contributing factor)
  - object - tree(s) (contributing factor)

## Analysis

DRG FLT, ONE OF THE PLTS DEMONSTRATED A NEGATIVE 'G' MANEUVER BY ENTERING A CLIMB, THEN MAKING A 'PUSH OVER' TO A DESCENT. HE THROTTLED BACK ON THE BACK SIDE OF THE MANEUVER TO MAINTAIN AIRSPEED. WHEN THE THROTTLE WAS READVANCED, THERE WAS NO ENG RESPONSE. EMERGENCY PROCEDURES WERE INITIATED, BUT THE ENG WOULD NOT RESTART. SUBSEQUENTLY, A NIGHT LANDING WAS MADE IN A WOODED AREA & THE ACFT WAS EXTENSIVELY DAMAGED. LITTLE FUEL WAS FOUND REMAINING IN THE ACFT, BUT FUEL HAD DRAINED FROM THE FUEL SYSTEM AFTER THE ACDNT. DURING A CHECK OF THE MAGNETOS, ONE PROVIDED NO SPARK & THE OTHER PROVIDED ONLY A WEAK SPARK. THE MAGNETOS WERE DISASSEMBLED; BOTH WERE FOUND TO HAVE LOOSE DISTRIBUTOR BLOCKS. ALSO, LARGE AMOUNTS OF CARBON HAD BUILT UP IN BOTH MAGNETO CASES, ALTHOUGH NO TRACE OF CARBON ARCING WAS FOUND.

## Aircraft

- Registration: [N7499G](https://openairdocs.org/deregistered/N7499G-1992-03-05), registration cancelled 1992-03-05, S/N 17259199 (OpenAirDocs)
- Reported make and model: CESSNA 172K
- Registry model: [Cessna 172K](https://openairdocs.org/model/cessna-172k) (registry code 2072430) (OpenAirDocs)
- Category: Airplane
- Serial number: 17259199
- Airframe hours: 5050
- Engines: LYCOMING O-320-E2D 150 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Moon/Wolf Air Service
- Registered owner: Glenn Richard Huff
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, July 22, 1987, 134 hours before
- Departed: 19D, MORA, MN
- Destination: 19D

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 50; commercial; airplane ratings: single-engine land, single-engine sea, multi-engine land; medical: class 2, valid medical--w/ waivers/lim; seat: right; flight hours: 2,362 total, 123 in this make and model

## Weather

- Conditions: Visual (VMC), Night/dark
- Lowest ceiling: none
- Temperature: 75 °F, dew point -0 °F

## 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 19880616024679A](https://openairdocs.org/incident/19880616024679A), Jun 16, 1988: Cessna 172K, Mora, MN, Substantial damage. Engine quit after negative "g" maneuver. Crashed into trees. Found minimum fuel and both mags worn and inoperative.

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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