A crj-700 aircraft 'gear disagree' master warning light illuminates upon T/O sequence followed by an 'anti-ice duct' overheat master warning. Emergency declared. Left main gear pin still installed.

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Attributes
ACN	763116
Time
Date	200711
Place
Locale Reference	airport : zzz.airport
State Reference	US
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : zzz.tracon
Make Model Name	Regional Jet 700 ER&LR
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	763116
Person 2
Affiliation	company : air carrier
Function	maintenance : technician
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : published procedure non adherence : far
Independent Detector	aircraft equipment other aircraft equipment : 'gear disagree' master warning
Resolutory Action	flight crew : diverted to another airport flight crew : declared emergency
Consequence	other
Factors
Maintenance	contributing factor : schedule pressure contributing factor : briefing performance deficiency : installation performance deficiency : logbook entry performance deficiency : non compliance with legal requirements
Supplementary
Problem Areas	Maintenance Human Performance Aircraft
Primary Problem	Maintenance Human Performance

Narrative:

Maintenance performed brake change on port gear. Released for us to board after 30 min delay. Upon takeoff sequence 'gear disagree' master warning. Extended gear and attempted to retract. Got same 'gear disagree' master warning. Extended landing gear; declared an emergency and requested landing in ZZZ. Vectored for approach. Ran climb and in-range checklists. Reached for book to get maintenance frequency. At that time got 'anti-ice duct' overheat master warning message. QRH commanded; 'leave icing conditions immediately.' ATC offered a hold. Declined hold per QRH and elected to land. Vectored to runway. Sent at least 2 ACARS messages to X. Broke out at 600 ft on ILS. Landed at 65K and change; used 66K landing numbers. Wrote up aircraft. Mechanic told first officer; 'I'm sorry; it was my fault; I got in a hurry.' port gear pin was still installed. Pushback crew failed to see it during pushback. Maintenance program to log gear pin installations to be scrupulously adhered to. Pushback crew should be alert for open doors and red flags upon pushback.

Original NASA ASRS Text

Title: A CRJ-700 ACFT 'GEAR DISAGREE' MASTER WARNING LIGHT ILLUMINATES UPON T/O SEQUENCE FOLLOWED BY AN 'ANTI-ICE DUCT' OVERHEAT MASTER WARNING. EMERGENCY DECLARED. LEFT MAIN GEAR PIN STILL INSTALLED.

Narrative: MAINT PERFORMED BRAKE CHANGE ON PORT GEAR. RELEASED FOR US TO BOARD AFTER 30 MIN DELAY. UPON TKOF SEQUENCE 'GEAR DISAGREE' MASTER WARNING. EXTENDED GEAR AND ATTEMPTED TO RETRACT. GOT SAME 'GEAR DISAGREE' MASTER WARNING. EXTENDED LNDG GEAR; DECLARED AN EMER AND REQUESTED LNDG IN ZZZ. VECTORED FOR APCH. RAN CLB AND IN-RANGE CHKLISTS. REACHED FOR BOOK TO GET MAINT FREQ. AT THAT TIME GOT 'ANTI-ICE DUCT' OVERHEAT MASTER WARNING MESSAGE. QRH COMMANDED; 'LEAVE ICING CONDITIONS IMMEDIATELY.' ATC OFFERED A HOLD. DECLINED HOLD PER QRH AND ELECTED TO LAND. VECTORED TO RWY. SENT AT LEAST 2 ACARS MESSAGES TO X. BROKE OUT AT 600 FT ON ILS. LANDED AT 65K AND CHANGE; USED 66K LNDG NUMBERS. WROTE UP ACFT. MECH TOLD FO; 'I'M SORRY; IT WAS MY FAULT; I GOT IN A HURRY.' PORT GEAR PIN WAS STILL INSTALLED. PUSHBACK CREW FAILED TO SEE IT DURING PUSHBACK. MAINT PROGRAM TO LOG GEAR PIN INSTALLATIONS TO BE SCRUPULOUSLY ADHERED TO. PUSHBACK CREW SHOULD BE ALERT FOR OPEN DOORS AND RED FLAGS UPON PUSHBACK.

Data retrieved from NASA's ASRS site as of January 2009 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.