B737 crew had flaps fail to extend after departure from blocks.

Attributes
ACN	408096
Time
Date	199807
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : phx
State Reference	AZ
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : clt
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	ground other : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 8000 flight time type : 3000
ASRS Report	408096
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

During single engine taxi, #1 engine running, flaps did not extend when flap handle moved to flap 1 degree position. When first officer stated 'flaps did not extend,' I decided to continue taxi because I wasn't sure if this was a normal indication during single-engine taxi and/or I knew I could figure out the problem once I got clear of the ramp area. I am unfamiliar with single-engine taxi cockpit indications because I never do single-engine taxi unless required by MEL. In this case, APU was inoperative/MEL'ed and I had to wait to start #2 engine on taxiway. After starting the #2 engine flaps extended because 'B' system was pressurized. When first officer pressed the recall annunciator, the hydraulic annunciator stayed illuminated and I looked up to see that 'B' system electric hydraulic pump low pressure light was on. I could not find popped circuit breaker for 'B' system electric hydraulic pump so I returned to gate. Once in gate, I located circuit breaker, reset, and pump worked normally. After conferring with maintenance control and dispatch, the flight departed without incident. Contributing factors: I had been on 4 weeks vacation. During before start check, I failed to see 'B' system electric hydraulic pressure low. During after start check, I also missed indication. Unfamiliar with single-engine taxi cockpit indications. Preoccupied with making left turn in tight ramp area with only #1 engine running.

Original NASA ASRS Text

Title: B737 CREW HAD FLAPS FAIL TO EXTEND AFTER DEP FROM BLOCKS.

Narrative: DURING SINGLE ENG TAXI, #1 ENG RUNNING, FLAPS DID NOT EXTEND WHEN FLAP HANDLE MOVED TO FLAP 1 DEG POS. WHEN FO STATED 'FLAPS DID NOT EXTEND,' I DECIDED TO CONTINUE TAXI BECAUSE I WASN'T SURE IF THIS WAS A NORMAL INDICATION DURING SINGLE-ENG TAXI AND/OR I KNEW I COULD FIGURE OUT THE PROB ONCE I GOT CLR OF THE RAMP AREA. I AM UNFAMILIAR WITH SINGLE-ENG TAXI COCKPIT INDICATIONS BECAUSE I NEVER DO SINGLE-ENG TAXI UNLESS REQUIRED BY MEL. IN THIS CASE, APU WAS INOP/MEL'ED AND I HAD TO WAIT TO START #2 ENG ON TXWY. AFTER STARTING THE #2 ENG FLAPS EXTENDED BECAUSE 'B' SYS WAS PRESSURIZED. WHEN FO PRESSED THE RECALL ANNUNCIATOR, THE HYD ANNUNCIATOR STAYED ILLUMINATED AND I LOOKED UP TO SEE THAT 'B' SYS ELECTRIC HYD PUMP LOW PRESSURE LIGHT WAS ON. I COULD NOT FIND POPPED CIRCUIT BREAKER FOR 'B' SYS ELECTRIC HYD PUMP SO I RETURNED TO GATE. ONCE IN GATE, I LOCATED CIRCUIT BREAKER, RESET, AND PUMP WORKED NORMALLY. AFTER CONFERRING WITH MAINT CTL AND DISPATCH, THE FLT DEPARTED WITHOUT INCIDENT. CONTRIBUTING FACTORS: I HAD BEEN ON 4 WKS VACATION. DURING BEFORE START CHK, I FAILED TO SEE 'B' SYS ELECTRIC HYD PRESSURE LOW. DURING AFTER START CHK, I ALSO MISSED INDICATION. UNFAMILIAR WITH SINGLE-ENG TAXI COCKPIT INDICATIONS. PREOCCUPIED WITH MAKING L TURN IN TIGHT RAMP AREA WITH ONLY #1 ENG RUNNING.

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.