A bd-700 flight crew executed a missed approach and diverted to an airport with a longer runway when...

Narrative:

We were cleared for the ILS. After intercept at approximately 3 miles outside the FAF with aircraft configured with flaps 16 and auto brake selected to low; approach advised crew of a thunderstorm 3-5 north of the airport in the event we had to go missed approach. Following that call; pilot flying requested gear down; pilot not flying selected gear down with 3 good indications. We then received (2) amber cautions. First; 50% brake degrade and second; auto brake failure. The auto brake system turned off automatically. Shortly after that pilot flying requested flaps 30; and pilot not flying selected flaps 30. At the FAF we began the descent on glide slope. Knowing that this indication was not going to be corrected in time for the landing; and with the advised thunderstorms north of the field; both pilots agreed to now execute the missed approach early. We began the missed approach; advised approach and requested vectors early to avoid thunderstorm and we climbed to 3;000 ft MSL and a heading of 180 as directed. As briefed earlier; we requested radar vectors to another airport as our divert for the use of the longer runway. Both pilots confirmed the computed required landing distance required for the alternate airport based on caution light procedures. Divert was uneventful. Caution lights remained on the remaining portion of the flight. Braking and thrust reverser usage were normal upon landing.

Original NASA ASRS Text

Title: A BD-700 flight crew executed a missed approach and diverted to an airport with a longer runway when brake and auto brake system warnings appeared after the landing gear was extended.

Narrative: We were cleared for the ILS. After intercept at approximately 3 miles outside the FAF with aircraft configured with flaps 16 and auto brake selected to low; Approach advised crew of a thunderstorm 3-5 north of the airport in the event we had to go missed approach. Following that call; pilot flying requested gear down; pilot not flying selected gear down with 3 good indications. We then received (2) Amber Cautions. First; 50% Brake Degrade and second; Auto Brake Failure. The Auto Brake System turned off automatically. Shortly after that pilot flying requested flaps 30; and pilot not flying selected flaps 30. At the FAF we began the descent on glide slope. Knowing that this indication was not going to be corrected in time for the landing; and with the advised thunderstorms north of the field; both pilots agreed to now execute the missed approach early. We began the missed approach; advised Approach and requested vectors early to avoid thunderstorm and we climbed to 3;000 FT MSL and a heading of 180 as directed. As briefed earlier; we requested radar vectors to another airport as our divert for the use of the longer runway. Both pilots confirmed the computed required landing distance required for the alternate airport based on Caution Light procedures. Divert was uneventful. Caution Lights remained on the remaining portion of the flight. Braking and thrust reverser usage were normal upon landing.

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	904623
Time
Date	201008
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Make Model Name	Global Express (BD700)
Operating Under FAR Part	Part 91
Flight Phase	Final Approach
Route In Use	Vectors
Flight Plan	IFR
Component
Aircraft Component	Normal Brake System
Person 1
Function	First Officer Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 30 Flight Crew Total 4500 Flight Crew Type 90
Events
Anomaly	Aircraft Equipment Problem Critical

A bd-700 flight crew executed a missed approach and diverted to an airport with a longer runway when brake and auto brake system warnings appeared after the landing gear was extended.