Smartwings B738 near Heraklion on Jun 14th 2023, loss of cabin pressure
Last Update: July 25, 2023 / 18:56:01 GMT/Zulu time
Incident Facts
Date of incident
Jun 14, 2023
Classification
Incident
Cause
Loss of cabin pressure
Airline
Smartwings
Flight number
QS-1111
Departure
Chania, Greece
Destination
Prague, Czech Republic
Aircraft Registration
OK-TSO
Aircraft Type
Boeing 737-800
ICAO Type Designator
B738
A replacement Boeing 737-800 registration OK-TVY reached Prague with a delay of about 8:20 hours.
The occurrence aircraft remained on the ground for about 7 hours, then departed for a positioning flight to Prague and is currently maintaining a maximum FL240 enroute.
Czechia's UZPLN reported in their quarterly bulletin, that the aircraft had been subjected to an engine cowl valve open indication prior to departure, the Greek maintenance engineer released the aircraft on minimum equipment list requirements. During engine start the crew noticed there was low bleed air pressure in the right hand engine and consulted with maintenance, the decision was made to continue the flight. Climbing through FL230 the cabin altitude warning horn sounded, the crew donned their oxygen masks, performed the memory items and checklist and initiated an emergency descent to FL100. The crew was unable to contact ATC, hence set the transponder to emergency code and performed the descent without clearance. A short time later contact with ATC was re-established and the aircraft was cleared to FL100, the cabin altitude was still climbing. After levelling off at FL080 the crew removed their oxygen masks, briefed the cabin, and decided to divert to Heraklion. The crew gradually opened the outflow valve, however, cabin altitude experienced large oscillations of +/- 1000 feet. It was established that Chania's Maintenance had not carried out the MEL procedures correctly resulting in incorrect handling of the valves controlling the cabin pressure.
Incident Facts
Date of incident
Jun 14, 2023
Classification
Incident
Cause
Loss of cabin pressure
Airline
Smartwings
Flight number
QS-1111
Departure
Chania, Greece
Destination
Prague, Czech Republic
Aircraft Registration
OK-TSO
Aircraft Type
Boeing 737-800
ICAO Type Designator
B738
This article is published under license from Avherald.com. © of text by Avherald.com.
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