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At about 1125 Western Standard Time on 13 October 2004, a Cessna Aircraft Company 182R (C182), registered VH-WPF, was inbound to Jandakot at 1,500 ft. It was approximately 1 NM south of the aerodrome approach point 'Shipyard' when it conflicted with an aircraft travelling in the opposite direction. The pilot reported sighting the aircraft at close range and initiated a steep right turn to avoid a possible collision. The aircraft were outside controlled airspace and operating under the Visual Flight Rules (VFR). The Australian Transport Safety Bureau classified the occurrence as both an Airprox1 and a serious incident2. Recorded radar data and a subsequent radio transmission, positively identified the other aircraft as a Piper Aircraft Corporation PA28-151 (Warrior), registered VH-PMW.

  1. An occurrence in which two or more aircraft come into such close proximity that a threat to the safety of the aircraft exists or may exist, in airspace where the aircraft are not subject to an air traffic separation standard or where separation is a pilot responsibility.
  2. Annex 13 to the Convention on International Civil Aviation defines a serious incident as:
    An incident involving circumstances indicating that an accident nearly occurred.
    Note 1.- The difference between an accident and a serious incident lies only in the result.
    Note 2.- Examples of serious incidents can be found in Attachment C of Annex 13 and in the International Civil Aviation Organization's Accident/Incident Reporting Manual (Doc 9156).

The radar data indicated that the Warrior departed Jandakot via 'Yangebup Lake' and 'Lake Thomson', which were tracking points published for VFR aircraft departing to the south. After passing overhead Lake Thompson, the pilot of the Warrior turned onto a westerly heading, tracking towards the coast at an altitude of 1,500 ft. The aircraft turned onto a southerly heading approaching the coast and passed about 0.5 NM to the southwest of Shipyard (see Figure 1).

General Aviation Aerodrome Procedures (GAAP) were in use at Jandakot. Procedures published in the Airservices Australia Aeronautical Information Publication (AIP), ENR 1.1, 30.3(d) stipulated that when departing, the pilot must:

track via departure procedures (if any) for the particular GAAP aerodrome as specified in ERSA [En route Supplement Australia], or track well clear of GAAP approach points and associated VFR routes, to reduce possible conflict with inbound aircraft.

The ERSA entry for Jandakot stated that aircraft departing via Yangebup Lake should climb to an altitude above 1,500 ft as soon as practical upon leaving the control zone.

The AIP ENR 1.1, 31.5 stipulated that whenever possible, pilots of aircraft arriving from outside controlled airspace:

must track visually via a GAAP aerodrome approach point as specified in ERSA.

The ERSA nominated 1,500 ft as the inbound altitude for arriving aircraft and Shipyard as one of the aerodrome approach points.

The pilot of the Warrior held an overseas flight crew licence and was operating in accordance with a CASA-issued Certificate of Validation. That validation had been recently issued and recognised the pilot's overseas qualifications and permitted the pilot to operate Australian-registered aircraft, while engaged in private day VFR operations. As part of the process of validation, the pilot had undertaken training on local procedures for operating at Jandakot.

The pilot of the Warrior reported that he did not see the opposite direction aircraft.

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Radar data confirmed that the pilot of the Warrior departed Jandakot via the relevant tracking points, but remained at 1,500 ft and tracked towards the coast. That tracked the aircraft towards an aerodrome approach point, at the same altitude as used by inbound aircraft.

The investigation concluded that if the Warrior pilot had, as recommended in the En Route Supplement Australia, climbed above 1,500 ft when clear of the Jandakot control zone, a conflict with inbound aircraft would have been less likely to occur.

General details
Date: 13 October 2004 Investigation status: Completed 
Time: 1132 WST  
Location   (show map):11 km SW Jandakot, Aero. Investigation type: Occurrence Investigation 
State: Western Australia Occurrence type: Near collision 
Release date: 27 October 2005 Occurrence class: Airspace 
Report status: Final Occurrence category: Serious Incident 
 Highest injury level: Serious 
Aircraft 1 details
Aircraft manufacturer: Cessna Aircraft Company 
Aircraft model: 182 
Aircraft registration: VH-WPF 
Serial number: 18268545 
Type of operation: Aerial Work 
Damage to aircraft: Nil 
Departure point:Jandakot WA
Departure time:1100 WST
Destination:Jandakot WA
Aircraft 2 details
Aircraft manufacturer: Piper Aircraft Corp 
Aircraft model: PA-28 
Aircraft registration: VH-PMW 
Serial number: 28-7515074 
Type of operation: Private 
Damage to aircraft: Nil 
Departure point:Jandakot WA
Departure time:1120 WST
Destination:Margaret River WA
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Last update 13 May 2014