ASN Wikibase Occurrence # 247989
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| Date: | Monday 25 January 2021 |
| Time: | |
| Type: |  Boeing 737-85F (WL) |
| Owner/operator: | Mango Airlines |
| Registration: | ZS-SJF |
| MSN: | 30006/688 |
| Year of manufacture: | 2000 |
| Fatalities: | Fatalities: 0 / Occupants: 125 |
| Aircraft damage: | None |
| Category: | Serious incident |
| Location: | NW of Durban -
 South Africa
|
| Phase: | En route |
| Nature: | Passenger - Scheduled |
| Departure airport: | Johannesburg-O.R. Tambo International Airport (JNB/FAOR) |
| Durban-King Shaka International Airport (DUR/FALE) | |
| Investigating agency: | CAA S.A. |
| Confidence Rating: |  Accident investigation report completed and information captured |
A Boeing 737-800 aircraft with registration ZS-SJF operated by Mango Airlines as flight JE251 departed O.R. Tambo International Airport (FAOR) on a scheduled flight to King Shaka International Airport (FALE). On-board the aircraft were eight crew (two pilots and six cabin crew) members and 117 passengers. Before take-off, pressurisation and air-conditioning system switches were set in accordance with (IAW) pre-take-off checks. The aircraft climbed and levelled off at flight level (FL) 350. During descent to FALE and after passing FL270 at 1232Z, a “Cabin Altitude” warning light illuminated, followed by an aural warning. The crew declared an emergency by broadcasting a MAYDAY call to the area controller who had the aircraft on primary surveillance radar. The crew promptly donned their oxygen masks and manually deployed the passengers’ oxygen masks. The captain called for Cabin Alt warning checks as stipulated in the aircraft’s Quick Reference Handbook (QRH). The aircraft levelled off at FL090 and a normal landing was carried out on runway 24 at FALE.
After the incident the aircraft was test flown on 3 and 6 February before it resumed service on 7 February 2021.
Probable Cause/s
The aircraft was unable to maintain cabin pressure for a safe environment of the passengers and the crew members due to the right-side air-conditioning pack bleed air leak; the left-side pack was unable to compensate for a defective right-side pack due to the No.1 engine’s 9th stage bleed air valve being locked closed prior to departing FAOR.
Contributing factor/s:
Defective right-side air-conditioning pack components that included the primary heat exchanger, air cycle machine, sense line and the trim air check valve.
Accident investigation:
 |
|
Sources:
http://www.caa.co.za/Latest%20Accident%20Reports/Preliminary%20Report%20ZS-SJF.pdf
https://www.flightradar24.com/data/aircraft/zs-sjf#26a918e0
History of this aircraft
Other occurrences involving this aircraft
| 17 August 2015 | ZS-SJF | South African Airways | 0 | East London Airport (ELS/FAEL) | |
min |
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 19-Feb-2021 17:21 | harro | Added |
Corrections or additions? ... Edit this accident description
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