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
Last Update: June 3, 2021 / 17:57:56 GMT/Zulu time
A replacement Boeing 737-800 registration PH-HXC reached Alicante with a delay of 2.5 hours.
The occurrence aircraft is still on the ground in Amsterdam about 24 hours after landing. Prior to the occurrence it had last flown on Feb 19th 2021.
On May 11th 2021 the Dutch Safety Board (Onderzoeksraad, DSB) announced, they have opened a short/brief investigation on Apr 29th 2021 stating: "Shortly after takeoff, erroneous altitude and airspeed values were displayed on the captain’s and first officer’s instruments. The crew was able to reach adequate airspeed and altitude by use of standby instruments and decided to divert to Amsterdam Airport Schiphol, where the aircraft made a safe landing."
On Jun 3rd 2021 the DSB reported they are investigating two occurrences, this one as well as Incident: TUI Belgium B738 near Amsterdam on Oct 3rd 2020, unreliable airspeed, 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.
Aircraft Registration Data
This article is published under license from Avherald.com. © of text by Avherald.com.
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