Amsterdam  - Several Dutch KLM Airlines aircraft have altimeter problems, Dutch BNR News Radio reported on Wednesday.

Referring to "classified files" given to BNR, the radio station said KLM has registered altimeter problems on 17 occasions in the past six months.

On February 25, a Boeing 737-800 from Turkish Airlines crashed near Amsterdam. Nine people were killed and 121 injured. Preliminary results from the ongoing investigation said a faulty altimeter was the cause of the crash.

BNR Radio said it spoke with KLM staff, who told the broadcaster it would be necessary to check all 737-model aircraft.

The file given to BNR radio also claimed that there might be more as-yet-unreported problems.

A KLM spokesman said in a reply that the Dutch airline had no problems with any altimeter.

"We will not comment on whether such problems existed in the past. If there have been any, then they have been solved." (dpa)