What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
N361PJ was unable to climb to assigned altitude (FL390). The aircraft was observed by ATC to be descending through FL380 and further descended to FL370. N361PJ is a modified Learjet model 36. The modifications include avcon industries supplemental type certificates (STC) privacy data omitted. These modifications, and others, allow the operation of the aircraft at increased takeoff weights to 19,600 pounds. The avcon STC does not include performance data for two engine climb performance at the higher gross weights. Extrapolated data from the approved flight manual indicate that the aircraft would be able to climb to FL390 under isa conditions at 19,000 pounds. At isa+10°, the aircraft would climb to FL370. If the outside air temperature was 10°c above standard, standard, the aircraft performed as predicted. Operating the aircraft at higher gross weights during periods of higher than standard temperatures significantly reduces climb performance.
As the FAA filed it
N361PJ WAS UNABLE TO CLIMB TO ASSIGNED ALTITUDE (FL390). THE AIRCRAFT WAS OBSERVED BY ATC TO BE DESCENDING THROUGH FL380 AND FURTHER DESCENDED TO FL370. N361PJ IS A MODIFIED LEARJET MODEL 36. THE MODIFICATIONS INCLUDE AVCON INDUSTRIES SUPPLEMENTAL TYPE CERTIFICATES (STC) ^PRIVACY DATA OMITTED^. THESE MODIFICATIONS, AND OTHERS, ALLOW THE OPERATION OF THE AIRCRAFT AT INCREASED TAKEOFF WEIGHTS TO 19,600 POUNDS. THE AVCON STC DOES NOT INCLUDE PERFORMANCE DATA FOR TWO ENGINE CLIMB PERFORMANCE AT THE HIGHER GROSS WEIGHTS. EXTRAPOLATED DATA FROM THE APPROVED FLIGHT MANUAL INDICATE THAT THE AIRCRAFT WOULD BE ABLE TO CLIMB TO FL390 UNDER ISA CONDITIONS AT 19,000 POUNDS. AT ISA+10°, THE AIRCRAFT WOULD CLIMB TO FL370. IF THE OUTSIDE AIR TEMPERATURE WAS 10°C ABOVE STANDARD, STANDARD, THE AIRCRAFT PERFORMED AS PREDICTED. OPERATING THE AIRCRAFT AT HIGHER GROSS WEIGHTS DURING PERIODS OF HIGHER THAN STANDARD TEMPERATURES SIGNIFICANTLY REDUCES CLIMB PERFORMANCE.
Other reports on N361PJ · 3
Matched to the same aircraft by N-number and date.