Scoot A319 near Singapore on Jun 14th 2019, loss of cabin pressure
Last Update: April 2, 2020 / 20:59:45 GMT/Zulu time
Singapore's AAIB rated the occurrence a serious incident and opened an investigation.
In late March 2020 Singapore's AAIB released their final report concluding the probable cause of the occurrence finally rated an incident were:
- The likely cause of the excessive cabin altitude was a corruption of LFE (landing field elevation) in the CPC. The CPC manufacturer believed that the corruption arose from a fatigue solder joint on the CPC circuit board.
- There had been past occurrences of excessive cabin altitude that were caused by a corruption of LFE value in the CPC, of which one was determined to have likely been caused by a fatigue solder joint, similar to this occurrence.
The AAIB reported the aircraft was descending through about FL320, when the captain (31, ATPL, 6,699 hours total, 6,467 hours on type), pilot flyin, felt a noticeable change of cabin pressure on her ears and queried the first officer (37, ATPL, 3,517 hours total, 924 hours on type). Descending through FL290 the crew observed a slow increase in cabin altitude, which was climbing at about 550fpm although the aircraft was descending at 2000 fpm. The crew increased the descent to 4000 fpm, as the climb of the cabin altitude was not normal. The crew requested further descent and was cleared to FL260 then FL200. Just when the first officer read back the clearance for FL200 the cabin altitude warning activated. The crew donned their oxygen masks and initiated an emergency descent to 9000 feet increasing the rate of descent to about 5300 fpm initially. The crew later reported they observed 13500 feet cabin altitude as the peak altitude, the passenger oxygen masks were not released.
The AAIB reported: "The examination revealed that a corrupted LFE value had triggered CPC 2 to activate the “landing at high altitude” procedure and was increasing the cabin altitude towards a higher LFE value than the correct one. The corrupted LFE value used by the CPC could not be determined."
The AAIB analysed: "CPC 2 was in control during the incident. The CPC processing logic was working as designed during the incident. The test by the CPC manufacturer conducted on the CPC 2 revealed that the incorrect increase of the cabin altitude arose from LFE value that was corrupted inside the CPC. The corruption of the LFE value was most likely caused by a fatigue solder joint on the CPC circuit board. "
This article is published under license from Avherald.com. © of text by Avherald.com.
Read unlimited articles and receive our daily update briefing. Gain better insights into what is happening in commercial aviation safety.
Support AeroInside by sending a small tip amount.
A Scoot Airlines Boeing 787-900, registration 9V-OJE performing flight TR-16 from Singapore (Singapore) to Perth,WA (Australia) with 356 passengers…
A Scoot Airbus A320-200, registration 9V-TAU performing flight TR-996 from Singapore (Singapore) to Taipei (Taiwan) with 178 passengers and 6 crew,…
A Scoot Boeing 787-9, registration 9V-OJC performing flight TR-6 from Singapore (Singapore) to Coolangatta,QL (Australia) with 341 people on board,…
A Scoot Boeing 787-8, registration 9V-OFD performing flight TR-24 from Singapore (Singapore) to Melbourne,VI (Australia) with 268 people on board,…
A Scoot Boeing 787-900, registration 9V-OJF performing flight TZ-1 from Sydney,NS (Australia) to Singapore (Singapore), was descending towards…
A British Airways Boeing 777-200, registration G-YMMR performing flight BA-81 from London Heathrow,EN (UK) to Accra (Ghana), was accelerating for…
An Air Inuit Boeing 737-200, registration C-GMAI performing flight 3H-754 from Donaldson,QC to Montreal,QC (Canada) with 52 passengers and 4 crew,…
Are you researching aviation incidents? Get access to AeroInside Insights, unlimited read access and receive the daily newsletter.Pick your plan and subscribe
A new way to document and demonstrate airworthiness compliance and aircraft value. Find out more.
ELITE Simulation Solutions is a leading global provider of Flight Simulation Training Devices, IFR training software as well as flight controls and related services. Find out more.
Never miss an article from AeroInside. Subscribe to our free weekly newsletter and join 4946 existing subscribers.
Popular aircraftAirbus A320
Boeing 737-800 MAX
Popular airlinesAmerican Airlines