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ASN Wikibase Occurrence # 219614
Last updated: 2 December 2021
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Date:24-MAR-1989
Time:15:10
Type:Silhouette image of generic P68 model; specific model in this crash may look slightly different
Partenavia P.68B Victor
Owner/operator:
Registration: VH-PNV
MSN: 85
Fatalities:Fatalities: 0 / Occupants: 5
Other fatalities:0
Aircraft damage: Substantial
Location:Maryvale, NT -   Australia
Phase: Landing
Nature:Private
Departure airport:YBHI
Destination airport:YBAS
Investigating agency: BASI
Narrative:
The pilot had booked the aircraft for an endorsement two days prior to the proposed flight. However, due to other commitments the aircraft did not become available until 1900 hours. This was unacceptable to the pilot and he was forced to arrange an endorsement with another training organisation on the following day. This arrangement meant that the pilot's preparation for the proposed flight became somewhat rushed. Additionally, the pilot had studied the pilot's notes for the Partenavia, but it was a different model which had a different fuel system to the aircraft which he subsequently flew. The flight proceeded in instrument meteorological conditions for most of the time. The pilot reported that the fuel gauges indicated just over half full as he passed Oodnadatta. However, from that position on, the fuel gauge indications started to decrease fairly rapidly and because of the worsening fuel situation, the pilot decided to inform Alice Springs Flight Service in order to expedite his arrival. The fuel quantity indications then began to drop at an alarming rate and the pilot decided to make a precautionary landing before the fuel supply was exhausted. After descending to lowest safe altitude, the pilot was able to see the ground through a hole in the cloud cover. He descended through the hole and landed on a flat piece of ground. During the landing run the nose gear collapsed just before the aircraft came to a stop. Due to weight consideration the pilot departed with full main fuel tanks only. He was under the mistaken belief that the total endurance with full main fuel tanks was 470 minutes and had this been so there would have been sufficient fuel to meet all requirements for the flight. However, total endurance with full mains (392 litres) is 314 minutes. Some fuel remained in the outboard fuel tanks but the pilot was probably not aware of this. The pilot calculated that a total endurance of 433 minutes was required for the planned flight. This figure is well in excess of the fuel carried on the flight. As the flight progressed strong headwinds were encountered and the pilot had been airborne for approximately 303 minutes when he made the precautionary landing 94 Km south-south-east of his destination. It was calculated that between 12 to 29 litres of usable fuel remained in the aircraft's tanks on landing. The pilot reported that fuel was being consumed at a faster rate from one fuel tank than the other and that he cross fed to balance the fuel in each main tank. When the aircraft's tanks were dipped after the accident they were found to contain approximately 80 litres of usable fuel, 70 litres in the right main and 11 litres in the right outboard fuel tank. It was later ascertained that the right fuel quantity indicator under read at lower readings and this misled the pilot into thinking that fuel was being used at a faster rate from the right hand fuel tank. It also misled the pilot into thinking that he was almost out of fuel where in fact he had sufficient fuel to fly to his destination, although not with the required fuel reserves. This accident was not the subject of an on-scene investigation.

Sources:

https://www.atsb.gov.au/publications/investigation_reports/1989/aair/aair198900804/
https://www.atsb.gov.au/media/32707/aair198900804.pdf

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


Images:

Photo of VH-PNV courtesy AirHistory.net


Avalon (YMAV / AVV)
26 February 2015; (c) Andrei Bezmylov

Revision history:

Date/timeContributorUpdates
17-Dec-2018 08:52 Pineapple Added
25-Jan-2020 12:42 Uli Elch Updated [Aircraft type]

Corrections or additions? ... Edit this accident description