ASN Wikibase Occurrence # 223535
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| Date: | Sunday 24 March 2019 |
| Time: | c. 05:00 UTC |
| Type: |  Airbus A320-232 |
| Owner/operator: | Scoot |
| Registration: | 9V-TAU |
| MSN: | 4561 |
| Year of manufacture: | 2010 |
| Engine model: | IAE V2527-A5 |
| Fatalities: | Fatalities: 0 / Occupants: 184 |
| Aircraft damage: | None |
| Category: | Serious incident |
| Location: | near Taiwan Taoyuan International Airport (RCTP) -
 Taiwan
|
| Phase: | Approach |
| Nature: | Passenger - Scheduled |
| Departure airport: | Singapore-Changi International Airport (SIN/WSSS) |
| Taipei-Taiwan Taoyuan International Airport (TPE/RCTP) | |
| Investigating agency: | ASC |
| Confidence Rating: |  Accident investigation report completed and information captured |
Scoot flight TR996, an A320-232 aircraft, took off from Singapore Changi International Airport (WSSS) for Taiwan Taoyuan International Airport (RCTP). During approach to RCTP, at an altitude of about 14,000 ft, the excessive cabin altitude waring was shown in the cockpit.
The pilots immediately donned oxygen masks and manually deployed cabin oxygen masks. The aircraft continued the approach to RCTP and landed safely.
Findings related to probable causes
1. The two automatic cabin pressurization systems had failed one after another during descent. This resulted in the aircraft losing the
automatic cabin pressurization function.
2. After the failure of both automatic cabin pressurization systems, the flight crew controlled the cabin pressure manually, as required by the ECAM checklist. The captain misunderstood the direction of operation for the MAN V/S CTL toggle switch and the corresponding effect on the position of outflow valve, and provided the wrong instruction to the first officer. The first officer did not recognize the incorrect
instruction to operate the outflow valve in the direction of opening, causing the cabin altitude to rise rapidly and eventually exceeding the cabin altitude limitation.
Accident investigation:
 |
|
Sources:
https://www.flightradar24.com/data/aircraft/9v-tau#1fe8a6fa
https://www.ttsb.gov.tw/media/3988/tr-996_executive-summary_english.pdf
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 26-Mar-2019 18:40 | harro | Added |
| 23-Jul-2020 15:51 | harro | Updated [Source, Narrative, Accident report, ] |
| 07-May-2023 08:14 | harro | Updated [[Source, Narrative, Accident report, ]] |
Corrections or additions? ... Edit this accident description
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