B757 captain was instructed to slow during a VNAV descent with a crossing restriction assigned. Pilo...

Narrative:

Mci center gave us a descent clearance to cross keokk intersection at FL330. This was programmed into the FMC and the descent was started on time using the VNAV; LNAV; and the autopilot. About 6 miles before keokk we were handed off to chicago center. We were on the descent path with the speed about 285 KTS. Upon call in to ZAU center we were given an immediate clearance to slow to 260 KTS. The frequency was busy and we were unable to question which clearance was more important; so the first officer extended the speedbrakes to comply with both as close as we could. When we were told to slow we were on descent path to cross keokk at FL330. We crossed keokk at about FL337 and 260 KTS. The controller made no remark about conflicting traffic or loss of separation. The controller was very busy and we had no time to ask about the clearance before we were at FL330 about 2 miles past keokk.

Original NASA ASRS Text

Title: B757 Captain was instructed to slow during a VNAV descent with a crossing restriction assigned. Pilot flying elected to slow immediately and crosses the fix 700 FT high.

Narrative: MCI Center gave us a descent clearance to cross KEOKK Intersection at FL330. This was programmed into the FMC and the descent was started on time using the VNAV; LNAV; and the autopilot. About 6 miles before KEOKK we were handed off to Chicago Center. We were on the descent path with the speed about 285 KTS. Upon call in to ZAU Center we were given an immediate clearance to slow to 260 KTS. The frequency was busy and we were unable to question which clearance was more important; so the First Officer extended the speedbrakes to comply with both as close as we could. When we were told to slow we were on descent path to cross KEOKK at FL330. We crossed KEOKK at about FL337 and 260 KTS. The Controller made no remark about conflicting traffic or loss of separation. The Controller was very busy and we had no time to ask about the clearance before we were at FL330 about 2 miles past KEOKK.

Data retrieved from NASA's ASRS site as of April 2012 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.

Attributes
ACN	915213
Time
Date	201010
Local Time Of Day	0601-1200
Place
Locale Reference	ZAU.ARTCC
State Reference	IL
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 240 Flight Crew Total 18000 Flight Crew Type 6700
Events
Anomaly	Deviation - Altitude Crossing Restriction Not Met Deviation - Procedural Clearance

B757 captain was instructed to slow during a VNAV descent with a crossing restriction assigned. Pilot flying elected to slow immediately and crosses the fix 700 ft high.