|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||1801 To 2400|
|Locale Reference||atc facility : apa|
|Altitude||msl bound lower : 16000|
msl bound upper : 19000
|Controlling Facilities||artcc : zdv|
|Operator||general aviation : personal|
|Make Model Name||Small Transport, Low Wing, 2 Recip Eng|
|Flight Phase||cruise other|
|Function||flight crew : single pilot|
|Qualification||pilot : commercial|
pilot : instrument
|Experience||flight time last 90 days : 50|
flight time total : 2100
flight time type : 40
|Anomaly||aircraft equipment problem : less severe|
altitude deviation : crossing restriction not met
non adherence : clearance
|Independent Detector||other controllera|
other flight crewa
|Resolutory Action||none taken : anomaly accepted|
none taken : detected after the fact
none taken : unable
|Primary Problem||Flight Crew Human Performance|
|Air Traffic Incident||Pilot Deviation|
En route from sck to apa at FL250 heater quit with 1 1/2 hours to go. Became colder but nowhere near debilitating. Nevertheless, definitely a preoccupation. Thought about advising controllers at slc or den center about situation but didn't think it would cause a problem. Cleared to descended and then to byson intersection, I thought to cross byson at or above 16000'. I'm fairly certain that I read it back that way. After byson, I was handed off to the next controller who said that the previous one wanted to know why I had not crossed at 16000'. I told him that I thought I was to cross at or above. Then, approaching the airport, I noticed that the lights on my avionics were off. Because of the cold I had put on a sport jacket and then a massive, bulky overcoat. A buckle on the coat had snagged the avionics master switch and turned the avionics off. I turned them back on and asked approach if he had been trying to get me and he replied affirmatively. Things would have been a lot easier if I had notified the controller when the heater failed. It would have not only alerted ATC, but I think it would have raised my own awareness that this was, indeed, an unusual situation that required extra vigilance.
Original NASA ASRS Text
Title: GA SMT ALT DEVIATION UNDERSHOT CROSSING RESTRICTION.
Narrative: ENRTE FROM SCK TO APA AT FL250 HEATER QUIT WITH 1 1/2 HRS TO GO. BECAME COLDER BUT NOWHERE NEAR DEBILITATING. NEVERTHELESS, DEFINITELY A PREOCCUPATION. THOUGHT ABOUT ADVISING CTLRS AT SLC OR DEN CENTER ABOUT SITUATION BUT DIDN'T THINK IT WOULD CAUSE A PROB. CLRED TO DESCENDED AND THEN TO BYSON INTXN, I THOUGHT TO CROSS BYSON AT OR ABOVE 16000'. I'M FAIRLY CERTAIN THAT I READ IT BACK THAT WAY. AFTER BYSON, I WAS HANDED OFF TO THE NEXT CTLR WHO SAID THAT THE PREVIOUS ONE WANTED TO KNOW WHY I HAD NOT CROSSED AT 16000'. I TOLD HIM THAT I THOUGHT I WAS TO CROSS AT OR ABOVE. THEN, APCHING THE ARPT, I NOTICED THAT THE LIGHTS ON MY AVIONICS WERE OFF. BECAUSE OF THE COLD I HAD PUT ON A SPORT JACKET AND THEN A MASSIVE, BULKY OVERCOAT. A BUCKLE ON THE COAT HAD SNAGGED THE AVIONICS MASTER SWITCH AND TURNED THE AVIONICS OFF. I TURNED THEM BACK ON AND ASKED APCH IF HE HAD BEEN TRYING TO GET ME AND HE REPLIED AFFIRMATIVELY. THINGS WOULD HAVE BEEN A LOT EASIER IF I HAD NOTIFIED THE CTLR WHEN THE HEATER FAILED. IT WOULD HAVE NOT ONLY ALERTED ATC, BUT I THINK IT WOULD HAVE RAISED MY OWN AWARENESS THAT THIS WAS, INDEED, AN UNUSUAL SITUATION THAT REQUIRED EXTRA VIGILANCE.
Data retrieved from NASA's ASRS site as of August 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.