Narrative:

Departure from rksi was uneventful; first officer flying captain monitoring and I was the relief pilot. Initial clearance was to climb to FL290; radar 1A departure. Subsequent radar vector followed by direct to sel and G597. After departure I was calculating times for the flight and heard ATC give us a leveloff at FL150 inbound traffic at FL160 which was acknowledged by the captain. As we were approaching FL150 there were several calls from ATC to advise of traffic and level at FL150 which we acknowledged; but ATC didn't seem to be receiving. The first officer also responded. I was getting ready to respond also. The inbound traffic was acquired visually and visual sighting was reported to ATC. When we leveled at FL150 it was discovered that the local altimeter setting was still set which was 1003 hectopascals with a transition altitude of FL140. The altimeters were quickly reset which showed us 200-300 ft high; the autoplt was disconnected and an aggressive push was initiated to return to FL150. The inbound traffic was still several mi away and we were back level at FL150 when the inbound traffic passed. There were no TCAS warnings or alerts. ATC called and asked why we didn't respond to radio calls and said that we had been 300 ft above altitude. We advised ATC that we had responded to all their radio calls and had inadvertently been delayed setting qne which caused the momentary altitude deviation. The remainder of the flight was uneventful.

Google
 

Original NASA ASRS Text

Title: MD11 CREW DEPARTING RKSI FORGETS TO SET QNE PASSING TRANSITION ALT.

Narrative: DEP FROM RKSI WAS UNEVENTFUL; FO FLYING CAPT MONITORING AND I WAS THE RELIEF PLT. INITIAL CLRNC WAS TO CLB TO FL290; RADAR 1A DEP. SUBSEQUENT RADAR VECTOR FOLLOWED BY DIRECT TO SEL AND G597. AFTER DEP I WAS CALCULATING TIMES FOR THE FLT AND HEARD ATC GIVE US A LEVELOFF AT FL150 INBOUND TFC AT FL160 WHICH WAS ACKNOWLEDGED BY THE CAPT. AS WE WERE APCHING FL150 THERE WERE SEVERAL CALLS FROM ATC TO ADVISE OF TFC AND LEVEL AT FL150 WHICH WE ACKNOWLEDGED; BUT ATC DIDN'T SEEM TO BE RECEIVING. THE FO ALSO RESPONDED. I WAS GETTING READY TO RESPOND ALSO. THE INBOUND TFC WAS ACQUIRED VISUALLY AND VISUAL SIGHTING WAS RPTED TO ATC. WHEN WE LEVELED AT FL150 IT WAS DISCOVERED THAT THE LCL ALTIMETER SETTING WAS STILL SET WHICH WAS 1003 HECTOPASCALS WITH A TRANSITION ALT OF FL140. THE ALTIMETERS WERE QUICKLY RESET WHICH SHOWED US 200-300 FT HIGH; THE AUTOPLT WAS DISCONNECTED AND AN AGGRESSIVE PUSH WAS INITIATED TO RETURN TO FL150. THE INBOUND TFC WAS STILL SEVERAL MI AWAY AND WE WERE BACK LEVEL AT FL150 WHEN THE INBOUND TFC PASSED. THERE WERE NO TCAS WARNINGS OR ALERTS. ATC CALLED AND ASKED WHY WE DIDN'T RESPOND TO RADIO CALLS AND SAID THAT WE HAD BEEN 300 FT ABOVE ALT. WE ADVISED ATC THAT WE HAD RESPONDED TO ALL THEIR RADIO CALLS AND HAD INADVERTENTLY BEEN DELAYED SETTING QNE WHICH CAUSED THE MOMENTARY ALTDEV. THE REMAINDER OF THE FLT WAS UNEVENTFUL.

Data retrieved from NASA's ASRS site as of January 2009 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.