TUI Belgium B738 near Amsterdam on Oct 3rd 2020, unreliable airspeed
Last Update: June 3, 2021 / 18:00:10 GMT/Zulu time
A replacement Boeing 737-800 registration OO-JAQ reached Funchal with a delay of about 4.5 hours.
The occurrence aircraft remained on the ground until Oct 11th 2020 before returning to service.
On Nov 9th 2020 the Dutch Onderzoeksraad (DSB) reported the crew observed differences in speed and altitude indications between the captain's and first officer's instruments. When the aircraft arrived at cruise altitude the differences became bigger. After the crew had attempted to fix the problem in vain, the aircraft returned to Amsterdam's Schiphol Airport for a safe landing. A short investigation was opened by the DSB.
On Jun 3rd 2021 the DSB reported they are investigating two occurrences, this one as well as Incident: Transavia B737 at Rotterdam on Apr 24th 2021, we think we are 6500 feet, military radar tells FL110, unreliable speed and altitude on both left and right pitot systems, where unreliable airspeeds following storage due to the Corona Pandemic had occurred. As result of the investigations so far the DSB stated, that in one case the pitot covers had not been removed, in the other case the pitot pipes had not been properly reconnected, in both cases the crew were able to use visual references outside the aircraft in favourable weather conditions. The DSB stated that EASA well as Boeing had issued warning identifying safety risks of returning aircraft to service after long term storage. The DSB further stated that there is no possibility for flight crews to test the pitot systems prior to departure. The DSB subsequently argues, that the safety risk was known in both occurrences, yet, they did happen. The DSB anticipates that an increasing number of aircraft will be returned to service in the days and months ahead leading to an increase of numbers of non-standard maintenance. The incidents show, that extra attention is needed to address this risk. This is why the DSB issues an interim warning to airlines and maintenance companies of this safety risk.
This article is published under license from Avherald.com. © of text by Avherald.com.
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