Created Sunday, Dec 6th 2020 23:09Z, last updated Sunday, Dec 6th 2020 23:09Z
A KLM Boeing 777-200, registration PH-BQE performing flight
KL-759 from Amsterdam (Netherlands) to San Jose (Costa Rica), was climbing out of Amsterdam's runway 24 when the aircraft transponder did not transmit any altitude information while all other data continued to be transmitted. While the crew was working the checklists trying to restore the transponder functionality, the aircraft continued the climb. Amsterdam radar needed to tell the crew however, that the UK would not accept the aircraft without a functioning Mode-C transponder, the crew advised they were not aware of the problem prior to departure. After consultation with dispatch and maintenance the crew decided to return to Amsterdam where the aircraft landed safely on runway 18R about 60 minutes after departure.
A replacement Boeing 777-200 registration PH-BQC reached San Jose with a delay of 3:20 hours.
The occurrence aircraft returned to service about 23 hours after landing back in Amsterdam, this time with fully working transponder again.
The occurrence aircraft had arrived into Amsterdam from Argentina with a transponder, that had failed near Cape Verde during the flight, see Incident: KLM B772 near Cape Verde on Dec 3rd 2020, transponder problems. The aircraft had remained on the ground for about 5 hours before departing for this occurrence flight.
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