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3 Jun 2021 - Dutch Safety Board warning to check aircraft returning to service after storage

The Dutch Safety Board has issued an interim warning for airlines that are returning aircraft to service after they are temporarily decommissioned.

The Council is currently investigating two incidents in which airliners encountered problems with speed and altitude indications immediately after take-off. The Transavia and TUI fly 737 aircraft were out of service for some time prior to the incident due to the corona pandemic. In one of the aforementioned events, a cover was not removed, in the other event some pipes were not connected correctly. In both cases, this led to the pilots being presented with incorrect altitude and speed information.

Alert to safety risks

With the warning issued today, the Research Council wants to alert airlines to the safety risks that can arise when aircraft are put back into service after a period of standstill. It is expected that this will happen frequently in the coming months with the relaxation of the corona measures.

You can read the full warning here. The aforementioned events that the Council is investigating are 'Incorrect altitude and speed indications, Boeing 737-700, Rotterdam The Hague Airport, 24 April 2021' and 'Different speed and altitude indications, Boeing 737-8K5, Amsterdam Airport Schiphol, 03 October 2020'.

Read the full warning here
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*** Updated 05 Aug 2023 ***

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Incorrect altitude and speed indications, Boeing 737-700, Rotterdam The Hague Airport . April 24, 2021

Shortly after take-off, the altitude and speed indication on the instruments of the commander and co-pilot indicated incorrect values. With the help of standby instruments, the crew was able to reach sufficient altitude and speed, after which it was decided to divert to Amsterdam Airport Schiphol, where the aircraft made a safe landing.

 

Different speed and altitude indications, Boeing 737-8K5, Amsterdam Airport Schiphol . 03 October 2020

During the climb, a difference occurred between the speed and altitude indications between the captain's instruments and co-pilot. When you arrived at cruising altitude, the difference widened. The crew tried in vain to solve the problem. It was decided to return to Schiphol, where the plane made a safe landing.
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