What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) Com 877 was level at FL370 and exercised emergency authority to descend to FL360 when an increase in air temperature made it operationally impossible to maintain FL370. The pilot began losing altitude simultaneous with advising ATC of the situation. The atcs advised the pilot of opposite direction traffic at FL350 and the pilot advised visual contact. After passing the traffic, COM877 was descended to FL350. Separation was lost with thetraffic, closest proximity was 2.5 miles and 1,000 feet.
As the FAA filed it
(-23) COM 877 WAS LEVEL AT FL370 AND EXERCISED EMERGENCY AUTHORITY TO DESCEND TO FL360 WHEN AN INCREASE IN AIR TEMPERATURE MADE IT OPERATIONALLY IMPOSSIBLE TO MAINTAIN FL370. THE PILOT BEGAN LOSING ALTITUDE SIMULTANEOUS WITH ADVISING ATC OF THE SITUATION. THE ATCS ADVISED THE PILOT OF OPPOSITE DIRECTION TRAFFIC AT FL350 AND THE PILOT ADVISED VISUAL CONTACT. AFTER PASSING THE TRAFFIC, COM877 WAS DESCENDED TO FL350. SEPARATION WAS LOST WITH THETRAFFIC, CLOSEST PROXIMITY WAS 2.5 MILES AND 1,000 FEET.