An air carrier LR24 freighter flight crew experienced a double flameout while flying over a thunders...

Attributes
ACN	403989
Time
Date	199805
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : pxv
State Reference	IN
Altitude	msl bound lower : 13000 msl bound upper : 41000
Environment
Flight Conditions	Mixed
Light	Night
Aircraft 1
Controlling Facilities	artcc : zid
Operator	common carrier : air carrier
Make Model Name	Learjet 24
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : instrument pilot : commercial
Experience	flight time last 90 days : 150 flight time total : 8500 flight time type : 1100
ASRS Report	403989
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical inflight encounter : weather other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : declared emergency flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

We were in cruise at FL410 when we penetrated the top of a thunderstorm. We requested an immediate climb, but as we began the climb an engine flamed out. We descended into the storm, and requested a vector to get us out of it. As we were descending in the thunderstorm, the second engine flamed out. We exited the clouds and got 1 engine relit at 13000 ft. We then started the other engine and proceeded to our destination. Callback conversation with reporter revealed the following information: the reporter said that he expected to clear the thunderstorm without difficulty until the first engine quit. He is not sure that the ignition was on, but he is sure that the anti-ice system was not on. When they had descended to FL250 they fell within the engine start parameters and they began an attempt to get a relight. The first several attempts failed and they shut down the engines before any attempt exceeded the engine temperature limits. When they got the first successful restart at 13000 ft, the engine was very slow to advance to the normal idle parameters and this sluggish response continued to the 100% power position. The second engine responded a little better and once the engines operated in normal cruise for a short time they responded normally. The flight crew then decided to climb to FL250 and continue to their destination. The maintenance technicians could find no problems with the engines during their ground checks. In addition to their engine problems, the flight crew found that the thunderstorm activity interfered with their communication with the ARTCC controller. The intense electrical activity caused low static to block or distort transmission and reception on their VHF radios. Their initial calls and the controllers' responses were not understandable, apparently. The reporter said that this situation continued for about 10000 ft during the descent. This first officer said that they did not declare an emergency, but they did describe the situation to the controller when they were able.

Original NASA ASRS Text

Title: AN ACR LR24 FREIGHTER FLC EXPERIENCED A DOUBLE FLAMEOUT WHILE FLYING OVER A TSTM AT FL410. THEY GOT THEIR FIRST ENG RELIT AT 13000 FT AND WERE ABLE TO RECOVER AND CONTINUE TO DEST.

Narrative: WE WERE IN CRUISE AT FL410 WHEN WE PENETRATED THE TOP OF A TSTM. WE REQUESTED AN IMMEDIATE CLB, BUT AS WE BEGAN THE CLB AN ENG FLAMED OUT. WE DSNDED INTO THE STORM, AND REQUESTED A VECTOR TO GET US OUT OF IT. AS WE WERE DSNDING IN THE TSTM, THE SECOND ENG FLAMED OUT. WE EXITED THE CLOUDS AND GOT 1 ENG RELIT AT 13000 FT. WE THEN STARTED THE OTHER ENG AND PROCEEDED TO OUR DEST. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR SAID THAT HE EXPECTED TO CLR THE TSTM WITHOUT DIFFICULTY UNTIL THE FIRST ENG QUIT. HE IS NOT SURE THAT THE IGNITION WAS ON, BUT HE IS SURE THAT THE ANTI-ICE SYS WAS NOT ON. WHEN THEY HAD DSNDED TO FL250 THEY FELL WITHIN THE ENG START PARAMETERS AND THEY BEGAN AN ATTEMPT TO GET A RELIGHT. THE FIRST SEVERAL ATTEMPTS FAILED AND THEY SHUT DOWN THE ENGS BEFORE ANY ATTEMPT EXCEEDED THE ENG TEMP LIMITS. WHEN THEY GOT THE FIRST SUCCESSFUL RESTART AT 13000 FT, THE ENG WAS VERY SLOW TO ADVANCE TO THE NORMAL IDLE PARAMETERS AND THIS SLUGGISH RESPONSE CONTINUED TO THE 100% PWR POS. THE SECOND ENG RESPONDED A LITTLE BETTER AND ONCE THE ENGS OPERATED IN NORMAL CRUISE FOR A SHORT TIME THEY RESPONDED NORMALLY. THE FLC THEN DECIDED TO CLB TO FL250 AND CONTINUE TO THEIR DEST. THE MAINT TECHNICIANS COULD FIND NO PROBS WITH THE ENGS DURING THEIR GND CHKS. IN ADDITION TO THEIR ENG PROBS, THE FLC FOUND THAT THE TSTM ACTIVITY INTERFERED WITH THEIR COM WITH THE ARTCC CTLR. THE INTENSE ELECTRICAL ACTIVITY CAUSED LOW STATIC TO BLOCK OR DISTORT XMISSION AND RECEPTION ON THEIR VHF RADIOS. THEIR INITIAL CALLS AND THE CTLRS' RESPONSES WERE NOT UNDERSTANDABLE, APPARENTLY. THE RPTR SAID THAT THIS SIT CONTINUED FOR ABOUT 10000 FT DURING THE DSCNT. THIS FO SAID THAT THEY DID NOT DECLARE AN EMER, BUT THEY DID DESCRIBE THE SIT TO THE CTLR WHEN THEY WERE ABLE.

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.

An air carrier LR24 freighter flight crew experienced a double flameout while flying over a thunderstorm at FL410. They got their first engine relit at 13000 ft and were able to recover and continue to destination.