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A B757-200 en route to phl experiences 2 series of radio failures that resulted in a temporary loss of their communications frequency. Over lrp VOR the flight came within 500 ft vertically and 4 mi horizontally of a B747.
| Attributes | |
| ACN | 428144 |
| Time | |
| Date | 199902 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : lrp.vortac |
| State Reference | PA |
| Altitude | msl bound lower : 16000 msl bound upper : 20000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zny.artcc tower : dca.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| Flight Phase | cruise : enroute altitude change cruise : level descent : intermediate altitude |
| Route In Use | arrival star : bunts one enroute airway : v210.airway |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zny.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B747-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| Flight Phase | climbout : intermediate altitude cruise : enroute altitude change |
| Route In Use | enroute airway : v210.airway |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : commercial pilot : multi engine pilot : instrument |
| Experience | flight time last 90 days : 180 flight time total : 16500 flight time type : 2000 |
| ASRS Report | 428144 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe conflict : airborne less severe non adherence : required legal separation non adherence : far |
| Independent Detector | atc equipment other atc equipment : center radio other controllera |
| Resolutory Action | controller : provided flight assist controller : issued advisory |
| Miss Distance | horizontal : 24000 vertical : 500 |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
We experienced no communication from center. Advised by company by ACARS to contact ZNY on different frequency. We were able to contact on third attempt. Able to make contact approximately 6 more times/different frequencys. Before second failure of communication over lrp, we passed 1000 ft below and about 2 mi north of a B747. No conflict. Made blind call on 121.5 to raise dca tower, who gave us a good frequency. No further loss of radio landing phl. On descent through FL260 and through 16000 ft we had a ground proximity alert (vicinity of lrp). On arrival in phl, we advised company of problems. They replaced a unit and cleared us to go to pit. No further radio loss or GPWS warning.
Original NASA ASRS Text
Title: A B757-200 ENRTE TO PHL EXPERIENCES 2 SERIES OF RADIO FAILURES THAT RESULTED IN A TEMPORARY LOSS OF THEIR COMS FREQ. OVER LRP VOR THE FLT CAME WITHIN 500 FT VERTLY AND 4 MI HORIZLY OF A B747.
Narrative: WE EXPERIENCED NO COM FROM CTR. ADVISED BY COMPANY BY ACARS TO CONTACT ZNY ON DIFFERENT FREQ. WE WERE ABLE TO CONTACT ON THIRD ATTEMPT. ABLE TO MAKE CONTACT APPROX 6 MORE TIMES/DIFFERENT FREQS. BEFORE SECOND FAILURE OF COM OVER LRP, WE PASSED 1000 FT BELOW AND ABOUT 2 MI N OF A B747. NO CONFLICT. MADE BLIND CALL ON 121.5 TO RAISE DCA TWR, WHO GAVE US A GOOD FREQ. NO FURTHER LOSS OF RADIO LNDG PHL. ON DSCNT THROUGH FL260 AND THROUGH 16000 FT WE HAD A GND PROX ALERT (VICINITY OF LRP). ON ARR IN PHL, WE ADVISED COMPANY OF PROBS. THEY REPLACED A UNIT AND CLRED US TO GO TO PIT. NO FURTHER RADIO LOSS OR GPWS WARNING.
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.