Because pilot failed to remove nose gear downlock prior to takeoff, nose gear wouldn't retract, necessitating return to field, with emergency ground equipment standing by.

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Attributes
ACN	433133
Time
Date	199904
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : bur.airport
State Reference	CA
Altitude	agl single value : 1000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sct.tracon tower : bur.tower
Operator	common carrier : air carrier
Make Model Name	Gulfstream III
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : initial
Route In Use	departure sid : n/s
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 : 13000 flight time type : 5000
ASRS Report	433133
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : multi engine pilot : commercial
Events
Anomaly	aircraft equipment problem : less severe non adherence : company policies non adherence : far non adherence : published procedure other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	none taken : detected after the fact
Consequence	other
Supplementary
Problem Areas	Weather Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

Copilot failed to remove nose gear downlock pin prior to departure. Maximum gross takeoff was made, nose gear failed to retract. 2 hours were flown to reduce weight to maximum landing weight. Landing was uneventful with emergency equipment standing by. Copilot was distraction during preflight. It was raining, copilot was ill and tired.

Original NASA ASRS Text

Title: BECAUSE PLT FAILED TO REMOVE NOSE GEAR DOWNLOCK PRIOR TO TKOF, NOSE GEAR WOULDN'T RETRACT, NECESSITATING RETURN TO FIELD, WITH EMER GND EQUIP STANDING BY.

Narrative: COPLT FAILED TO REMOVE NOSE GEAR DOWNLOCK PIN PRIOR TO DEP. MAX GROSS TKOF WAS MADE, NOSE GEAR FAILED TO RETRACT. 2 HRS WERE FLOWN TO REDUCE WT TO MAX LNDG WT. LNDG WAS UNEVENTFUL WITH EMER EQUIP STANDING BY. COPLT WAS DISTR DURING PREFLT. IT WAS RAINING, COPLT WAS ILL AND TIRED.

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.