B737 crew exceeded cleared speed limit as assigned by P50.

Attributes
ACN	477579
Time
Date	200007
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	navaid : bxk.vortac
State Reference	AZ
Altitude	msl single value : 14000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : zab.artcc tracon : p50.tracon
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : vacating altitude climbout : intermediate altitude
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zab.artcc tracon : p50.tracon
Operator	common carrier : air carrier
Make Model Name	A320
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 130 flight time total : 22000 flight time type : 1000
ASRS Report	477579
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : cfi
Experience	flight time total : 9000
ASRS Report	477580
Events
Anomaly	aircraft equipment problem : less severe non adherence : clearance non adherence : company policies non adherence : published procedure other anomaly other anomaly other
Independent Detector	other controllera
Resolutory Action	controller : issued alert controller : issued new clearance controller : separated traffic
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were given an immediate takeoff clearance behind an A320 and were initially concerned about wake turbulence. Upon selecting VNAV at 3000 ft AGL, the computer tried to slow the aircraft to 210 KTS from 220 KTS instead of accelerating to 250 KTS. After checking that the flaps were up as well as all leading edge devices, we researched the problem in the computer. We solved the computer problem but while our attention was diverted by our FMC problem we missed a maintain 250 KT restr by phx departure control. Passing 14000 ft, we were asked to verify our 250 KT speed. Unfortunately, we had accelerated to 300 KTS. We were given a 90 degree turn and slowed to 250 KTS. Supplemental information from acn 477580: I called for VNAV at about this time and the airspeed bug retarded to 210 KTS. The captain (PNF) reset the map to level change 250 KTS and set out to figure out why it had commanded a 210 KT speed. Neither of us recalled that clearance -- possibly due to the distraction of the malfunctioning FMC.

Original NASA ASRS Text

Title: B737 CREW EXCEEDED CLRED SPD LIMIT AS ASSIGNED BY P50.

Narrative: WE WERE GIVEN AN IMMEDIATE TKOF CLRNC BEHIND AN A320 AND WERE INITIALLY CONCERNED ABOUT WAKE TURB. UPON SELECTING VNAV AT 3000 FT AGL, THE COMPUTER TRIED TO SLOW THE ACFT TO 210 KTS FROM 220 KTS INSTEAD OF ACCELERATING TO 250 KTS. AFTER CHKING THAT THE FLAPS WERE UP AS WELL AS ALL LEADING EDGE DEVICES, WE RESEARCHED THE PROB IN THE COMPUTER. WE SOLVED THE COMPUTER PROB BUT WHILE OUR ATTN WAS DIVERTED BY OUR FMC PROB WE MISSED A MAINTAIN 250 KT RESTR BY PHX DEP CTL. PASSING 14000 FT, WE WERE ASKED TO VERIFY OUR 250 KT SPD. UNFORTUNATELY, WE HAD ACCELERATED TO 300 KTS. WE WERE GIVEN A 90 DEG TURN AND SLOWED TO 250 KTS. SUPPLEMENTAL INFO FROM ACN 477580: I CALLED FOR VNAV AT ABOUT THIS TIME AND THE AIRSPD BUG RETARDED TO 210 KTS. THE CAPT (PNF) RESET THE MAP TO LEVEL CHANGE 250 KTS AND SET OUT TO FIGURE OUT WHY IT HAD COMMANDED A 210 KT SPD. NEITHER OF US RECALLED THAT CLRNC -- POSSIBLY DUE TO THE DISTR OF THE MALFUNCTIONING FMC.

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.