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ASN Wikibase Occurrence # 214094
Last updated: 5 December 2019
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Date:11-JAN-1985
Time:11:32
Type:Silhouette image of generic C172 model; specific model in this crash may look slightly different
Cessna 172K
Owner/operator:
Registration: VH-RGT
C/n / msn:
Fatalities:Fatalities: 0 / Occupants: 3
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Location:3km ESE of Mittagong, NSW -   Australia
Phase: Initial climb
Nature:Private
Departure airport:YMIG
Destination airport:YCFS
Investigating agency: BASI
Narrative:
The pilot reported that the aircraft became airborne after a ground roll of about 700 metres and initial climb was commenced at an indicated airspeed of 65 knots. Soon after lift off a lack of climb performance became noticeable and the airspeed reduced to 50 knots. Several gradual turns were made to avoid trees but the aircraft struck trees on rising terrain and impacted the ground. Examination of the engine revealed that the two front cylinders had been running over-rich. An incorrect model carburettor was found to have been fitted to the engine. However, it could not be determined if this had been the cause of the of the fuel mixture problem. Local aero club pilots reported that, in this aircraft, with the mixture control in the full rich position, the engine obtained about 200 RPM less than the optimum. It was well known to club pilots that the mixture control required leaning out by about three centimetres before take-off to achieve the correct engine performance. On the day of the accident, the pilot leaned the mixture slightly less than one centrimetre. It is likely that the loss of aircraft performance was the result of reduced engine performance caused by an over-rich mixture.

Sources:

https://www.atsb.gov.au/publications/investigation_reports/1985/aair/aair198502509/
https://www.atsb.gov.au/media/30825/aair198502509.pdf

Accident investigation:
cover
  
Investigating agency: BASI
Status: Investigation completed
Duration:
Download report: Final report


Revision history:

Date/timeContributorUpdates
06-Aug-2018 05:55 Pineapple Added

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