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Fuel Caps Secured – Check!

  • Safety

In late July 2019, a TVSA aircraft was inadvertently flown with a missing fuel cap on the right tank. The aircraft was on a solo navigation exercise around the bay and returned to YBSS safely. The following information has been extracted from the reporting that took place following the incident.

Initial Report

Piper style fuel cap located on RWY27 by a TVSA staff member taxiing out for a circuits lesson. Other aircraft in the circuit area contacted over the radio and requested to inspect their fuel caps. It was later determined by staff on the ground that the missing cap belonged to PJX which was on a solo flight around the bay.

Upon return, PIC reported the following:

  • Departed YBSS on the left tank and switched to the right tank prior to arrival at YMMB.
  • Noticed a lower fuel figure than expected in the right tank on departure from YMMB.
  • Switched back to the left tank and continued the planned flight around the bay.
  • Visually identified the missing fuel cap around Pt Lonsdale and made a diversion to return to YBSS.

On landing, the aircraft was met by staff and calculations estimated the aircraft to have lost roughly 10-15L of fuel (based on block fuel burn rates).

Contributing Factors

PIC was an unlicensed pilot and was conducting first flight of the day in the aircraft. As such, a daily inspection conducted by an instructor was required as part of solo sign-out procedure. This was conducted satisfactorily by the staff member, but the aircraft was subsequently refuelled by the student. This resulted in the loose fuel cap not being captured through a pre-flight inspection, as would normally be the case.


  • TVSA procedures adjusted to ensure inspections carried out by instructors for solo students only occurred after refuelling.
  • Staff and students briefed on the importance of thorough pre-flight inspection.
  • ATSB reporting completed.


Thankfully, this incident had a good outcome but could have ended very differently. It highlighted the need for a thorough aircraft inspection, as well as the need to remain alert to possible errors at all times.