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Flight crew of DC9-30 parked at gate has radio altimeter flag appear. No luck with tripping and resetting the circuit breakers. Flight attendant passenger electronic device check showed a passenger using a pager. When shut off, the radio altimeter returned to normal.
| Attributes | |
| ACN | 412258 |
| Time | |
| Date | 199808 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : lan |
| State Reference | MI |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 30 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : parked |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : cfi pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 230 flight time total : 16000 flight time type : 5000 |
| ASRS Report | 412258 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : overcame equipment problem other |
| Consequence | Other |
| Supplementary | |
| Air Traffic Incident | other |
Narrative:
While parked at gate X the captain's radar altimeter flag appeared. Pressing the test button and tripping and resetting the circuit breakers did not affect it, so I asked the lead flight attendant to do a passenger electronic device walk.' she came back and said that a passenger in first class seat had been using a pager but had just shut it off. The radar altimeter returned to normal and tested ok. Maintenance did a diagnostic test on the radar altimeter and it checked out ok. This was my 4TH passenger electronic device incident with pagers in 8 months. The loss of the captain's radio altimeter is significant because it also disables the TCASII and GPWS system.
Original NASA ASRS Text
Title: FLC OF DC9-30 PARKED AT GATE HAS RADIO ALTIMETER FLAG APPEAR. NO LUCK WITH TRIPPING AND RESETTING THE CIRCUIT BREAKERS. FLT ATTENDANT PAX ELECTRONIC DEVICE CHK SHOWED A PAX USING A PAGER. WHEN SHUT OFF, THE RADIO ALTIMETER RETURNED TO NORMAL.
Narrative: WHILE PARKED AT GATE X THE CAPT'S RADAR ALTIMETER FLAG APPEARED. PRESSING THE TEST BUTTON AND TRIPPING AND RESETTING THE CIRCUIT BREAKERS DID NOT AFFECT IT, SO I ASKED THE LEAD FLT ATTENDANT TO DO A PAX ELECTRONIC DEVICE WALK.' SHE CAME BACK AND SAID THAT A PAX IN FIRST CLASS SEAT HAD BEEN USING A PAGER BUT HAD JUST SHUT IT OFF. THE RADAR ALTIMETER RETURNED TO NORMAL AND TESTED OK. MAINT DID A DIAGNOSTIC TEST ON THE RADAR ALTIMETER AND IT CHKED OUT OK. THIS WAS MY 4TH PAX ELECTRONIC DEVICE INCIDENT WITH PAGERS IN 8 MONTHS. THE LOSS OF THE CAPT'S RADIO ALTIMETER IS SIGNIFICANT BECAUSE IT ALSO DISABLES THE TCASII AND GPWS SYS.
Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.