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B737-400 flight crew lost communications with ZNY and phl until discovering a stuck microphone condition.
| Attributes | |
| ACN | 562566 |
| Time | |
| Date | 200210 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : phl.airport |
| State Reference | PA |
| Altitude | msl single value : 10000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zny.artcc tower : phl.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B737-400 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : approach descent : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 225 flight time total : 15000 flight time type : 5000 |
| ASRS Report | 562566 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : published procedure other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : com other flight crewa other flight crewb |
| Resolutory Action | flight crew : overcame equipment problem other |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
Side panel microphone fell into captain's flight bag. After briefing the approach and preliminary landing checklist, set approach book on top of flight bag that then pushed down on standby microphone switch. This blocked ZNY frequency 133.35. As we attempted to contact phl approach and tower, we blocked their frequency for about 8 mins. This aircraft had the old style heavy microphone and is mounted on the captain's left side panel below the sliding window. This location is easy to bump when getting material out of one's flight bag. We initially thought we had a lost communication situation as all frequencys on both radios were blocked. Once we realized what occurred, we re-established communication and continued to a normal approach and landing.
Original NASA ASRS Text
Title: B737-400 FLC LOST COMS WITH ZNY AND PHL UNTIL DISCOVERING A STUCK MIKE CONDITION.
Narrative: SIDE PANEL MIKE FELL INTO CAPT'S FLT BAG. AFTER BRIEFING THE APCH AND PRELIMINARY LNDG CHKLIST, SET APCH BOOK ON TOP OF FLT BAG THAT THEN PUSHED DOWN ON STANDBY MIKE SWITCH. THIS BLOCKED ZNY FREQ 133.35. AS WE ATTEMPTED TO CONTACT PHL APCH AND TWR, WE BLOCKED THEIR FREQ FOR ABOUT 8 MINS. THIS ACFT HAD THE OLD STYLE HVY MIKE AND IS MOUNTED ON THE CAPT'S L SIDE PANEL BELOW THE SLIDING WINDOW. THIS LOCATION IS EASY TO BUMP WHEN GETTING MATERIAL OUT OF ONE'S FLT BAG. WE INITIALLY THOUGHT WE HAD A LOST COM SIT AS ALL FREQS ON BOTH RADIOS WERE BLOCKED. ONCE WE REALIZED WHAT OCCURRED, WE RE-ESTABLISHED COM AND CONTINUED TO A NORMAL APCH AND LNDG.
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.