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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Flight crew of a lear jet 36 lost communications during high altitude after departure from anchorage prior to reaching their flight plan requested altitude. Therefore, after approximately 20 mins of trying to contact them they climbed to their filed en route altitude. They subsequently received confirmation of their requested altitude through another ARTCC center.
| Attributes | |
| ACN | 336605 |
| Time | |
| Date | 199605 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : cdb |
| State Reference | AK |
| Altitude | msl bound lower : 33000 msl bound upper : 37000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zan |
| Operator | common carrier : air taxi |
| Make Model Name | Learjet 36 |
| Operating Under FAR Part | Part 135 |
| Flight Phase | climbout : intermediate altitude cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air taxi |
| Function | flight crew : captain oversight : pic |
| Qualification | other other : other pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 130 flight time total : 4300 flight time type : 800 |
| ASRS Report | 336605 |
| Person 2 | |
| Affiliation | company : air taxi |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
After departure from cold bay, ak, we were given FL290 and expect higher after radar contact. After zan confirmed they had radar contact, we were given FL330. 10 mins later zan called us but did not hear our replies. We attempted to contact zan on 118.5 and 132.9 at least 20 times over the next 10-20 mins. We also attempted a number of HF frequencys with no luck. After assuming a lost communication situation, we decided we should climb to our filed altitude of FL370. We were given the initial clearance of FL290, expect higher after radar contact. We were in radar contact at last communication and had filed for FL370. We calculated that we would be below minimum fuel if we maintained FL330 which also influenced our decision to climb to FL370. We have tried to figure out how to avoid this situation from recurring, but think we followed the proper procedures and hope that we can find an active frequency a little quicker next time to avoid any uncertainties. We eventually contacted hnl radio on 113.30 and, after hnl spoke with ZOA, we were cleared to maintain FL370.
Original NASA ASRS Text
Title: FLC OF A LEAR JET 36 LOST COMS DURING HIGH ALT AFTER DEP FROM ANCHORAGE PRIOR TO REACHING THEIR FLT PLAN REQUESTED ALT. THEREFORE, AFTER APPROX 20 MINS OF TRYING TO CONTACT THEM THEY CLBED TO THEIR FILED ENRTE ALT. THEY SUBSEQUENTLY RECEIVED CONFIRMATION OF THEIR REQUESTED ALT THROUGH ANOTHER ARTCC CTR.
Narrative: AFTER DEP FROM COLD BAY, AK, WE WERE GIVEN FL290 AND EXPECT HIGHER AFTER RADAR CONTACT. AFTER ZAN CONFIRMED THEY HAD RADAR CONTACT, WE WERE GIVEN FL330. 10 MINS LATER ZAN CALLED US BUT DID NOT HEAR OUR REPLIES. WE ATTEMPTED TO CONTACT ZAN ON 118.5 AND 132.9 AT LEAST 20 TIMES OVER THE NEXT 10-20 MINS. WE ALSO ATTEMPTED A NUMBER OF HF FREQS WITH NO LUCK. AFTER ASSUMING A LOST COM SIT, WE DECIDED WE SHOULD CLB TO OUR FILED ALT OF FL370. WE WERE GIVEN THE INITIAL CLRNC OF FL290, EXPECT HIGHER AFTER RADAR CONTACT. WE WERE IN RADAR CONTACT AT LAST COM AND HAD FILED FOR FL370. WE CALCULATED THAT WE WOULD BE BELOW MINIMUM FUEL IF WE MAINTAINED FL330 WHICH ALSO INFLUENCED OUR DECISION TO CLB TO FL370. WE HAVE TRIED TO FIGURE OUT HOW TO AVOID THIS SIT FROM RECURRING, BUT THINK WE FOLLOWED THE PROPER PROCS AND HOPE THAT WE CAN FIND AN ACTIVE FREQ A LITTLE QUICKER NEXT TIME TO AVOID ANY UNCERTAINTIES. WE EVENTUALLY CONTACTED HNL RADIO ON 113.30 AND, AFTER HNL SPOKE WITH ZOA, WE WERE CLRED TO MAINTAIN FL370.
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.