ASN Wikibase Occurrence # 248062
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| Date: | Monday 10 August 2020 |
| Time: | 07:40 |
| Type: |  Fokker 100 |
| Owner/operator: | QantasLink, op by Network Aviation |
| Registration: | VH-NHC |
| MSN: | 11481 |
| Year of manufacture: | 1993 |
| Fatalities: | Fatalities: 0 / Occupants: |
| Aircraft damage: | None |
| Category: | Serious incident |
| Location: | 167 km SSE Geraldton -
 Australia
|
| Phase: | En route |
| Nature: | Passenger - Scheduled |
| Departure airport: | Perth Airport, WA (PER/YPPH) |
| Geraldton, WA | |
| Investigating agency: | ATSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
On the morning of 10 August 2020, a Fokker 100, registered VH-NHC and operated by Network Aviation, on behalf of QantasLink, departed Perth Airport, bound for Geraldton, Western Australia. While in the cruise, at about 26,000 ft, the flight crew received an excessive cabin altitude warning, with no associated faults identified. The flight crew donned their oxygen masks and initiated an emergency descent. The oxygen masks in the cabin were manually deployed by the flight crew. Once the aircraft levelled out at about 9,000 ft, the flight crew advised that oxygen was no longer required. The flight crew then continued to Geraldton for an uneventful landing.
An insulation blanket had become wedged in one of the two air outflow valves, preventing modulation of the aircraft’s cabin pressure. In addition, it was established that the insulation blanket had not been correctly secured to the structure, which allowed it to migrate into the outflow valve.
While the manufacturer's instructions for maintenance inspections detailed that insulation blankets could be removed 'as necessary', they did not reference the insulation blanket installation procedure. In addition, it was identified that the insulation blankets were likely not correctly installed prior to being moved for structural inspections. A combination of these two conditions resulted in the insulation blankets not being secured to the structure following maintenance.
Accident investigation:
 |
|
Sources:
ATSB Ref AO-2020-041
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 20-Feb-2021 19:45 | harro | Added |
| 09-Jun-2022 00:05 | Ron Averes | Updated [Operator] |
Corrections or additions? ... Edit this accident description
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