Narrative:

Location about 15 mins east tbc, approaching hbu southeast of publication. We were on flight plan (nrp) when ATC gave us a rerte. We copied the route and advised ATC unable until I spoke with my dispatcher. I contacted dispatch and queried her on rides, NOTAMS, CAT reports and alerts in the rerte area. At the same time, I requested a performance evaluation to meet method 1 restrs per our flight plan. The dispatcher advised us the route was approved and performance was met. We accepted ATC's rerte. Approximately 5-7 mins after rerte, we received moderate turbulence and a split second later, we received severe mountain wave and exceeded vmo by 15 KTS or .87 mach. Mach limits are vmo/.86 mach at altitude. We descended from FL370 to FL330 and received a smooth ride with no mountain wave thereafter. My first officer was the PF. He did an excellent job handling the problem and getting the aircraft speed under control. We maintained turbulence penetration speed until well east of the associated area. We assessed the situation, advised ATC and dispatch and maintenance coordination of our problem, and decided to continue to our destination (ord). There were no vibration and or control problems. All system operated normally. The flight continued without further event to ord. Upon arrival at ord, we were met by ord mechanics and guidelines for airframe overspd. I reviewed the problem with the mechanic and the exact indications. We entered the situation in the logbook and turned the aircraft over to company maintenance.

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Original NASA ASRS Text

Title: AFTER AN ATC RERTE, A B757-200 FLT RUNS INTO A MOUNTAIN WAVE OVER THE ROCKIES, SW OF HBU, CO.

Narrative: LOCATION ABOUT 15 MINS E TBC, APCHING HBU SE OF PUB. WE WERE ON FLT PLAN (NRP) WHEN ATC GAVE US A RERTE. WE COPIED THE RTE AND ADVISED ATC UNABLE UNTIL I SPOKE WITH MY DISPATCHER. I CONTACTED DISPATCH AND QUERIED HER ON RIDES, NOTAMS, CAT RPTS AND ALERTS IN THE RERTE AREA. AT THE SAME TIME, I REQUESTED A PERFORMANCE EVALUATION TO MEET METHOD 1 RESTRS PER OUR FLT PLAN. THE DISPATCHER ADVISED US THE RTE WAS APPROVED AND PERFORMANCE WAS MET. WE ACCEPTED ATC'S RERTE. APPROX 5-7 MINS AFTER RERTE, WE RECEIVED MODERATE TURB AND A SPLIT SECOND LATER, WE RECEIVED SEVERE MOUNTAIN WAVE AND EXCEEDED VMO BY 15 KTS OR .87 MACH. MACH LIMITS ARE VMO/.86 MACH AT ALT. WE DSNDED FROM FL370 TO FL330 AND RECEIVED A SMOOTH RIDE WITH NO MOUNTAIN WAVE THEREAFTER. MY FO WAS THE PF. HE DID AN EXCELLENT JOB HANDLING THE PROB AND GETTING THE ACFT SPD UNDER CTL. WE MAINTAINED TURB PENETRATION SPD UNTIL WELL E OF THE ASSOCIATED AREA. WE ASSESSED THE SIT, ADVISED ATC AND DISPATCH AND MAINT COORD OF OUR PROB, AND DECIDED TO CONTINUE TO OUR DEST (ORD). THERE WERE NO VIBRATION AND OR CTL PROBS. ALL SYS OPERATED NORMALLY. THE FLT CONTINUED WITHOUT FURTHER EVENT TO ORD. UPON ARR AT ORD, WE WERE MET BY ORD MECHS AND GUIDELINES FOR AIRFRAME OVERSPD. I REVIEWED THE PROB WITH THE MECH AND THE EXACT INDICATIONS. WE ENTERED THE SIT IN THE LOGBOOK AND TURNED THE ACFT OVER TO COMPANY MAINT.

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.