"Brakes Hot" Ecam Msg
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OK, great ... so, without talking of WHEEL WELL FIRE warning, is it fair to say that an EICAS caution or warning, or a QRH procedure requesting to lower the gears, would not come up as long as one brake temp did not reach that 500C equivalent value ?
SMOC, do you agree with that value, or is it somewhat different on 747 Classic or any Boeing product ?
I was also surprised to learn that wheel well fire detection was available on option for 330/340, thank you Zeke.
Would you know which percentage of 330/340 fleet is equipped with that option ?
SMOC, do you agree with that value, or is it somewhat different on 747 Classic or any Boeing product ?
I was also surprised to learn that wheel well fire detection was available on option for 330/340, thank you Zeke.
Would you know which percentage of 330/340 fleet is equipped with that option ?
As for 757 wheel well fire, fairly simple. That same manual says there are two loops (one each wheel well) with sensors that trigger when temperatures reach 200°C. There is an EICAS message "Wheel Well Fire" and a "fire" light just underneath the light "brake temp" and next to the three greens. At the same time the master warning signal and lights go on. There is also a test button at the lower right pedestal corner.
Surprises me that brakes can go to 500° without warnings, and well temps can go to 200°. So there must be something requesting the wheels to stay lowered. In real, I've never seen a 757 brake going above figure "2" on EICAS.
I looked up some cockpit pictures on the net, and almost every airline has the brake temp option installed.
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OK, great ... so, without talking of WHEEL WELL FIRE warning, is it fair to say that an EICAS caution or warning, or a QRH procedure requesting to lower the gears, would not come up as long as one brake temp did not reach that 500C equivalent value ?
SMOC, do you agree with that value, or is it somewhat different on 747 Classic or any Boeing product ?
SMOC, do you agree with that value, or is it somewhat different on 747 Classic or any Boeing product ?
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The 300 deg C brake temp discussed in this thread is related to a performance limitation for an RTO.
The reason this "hot brake" ecam message can be generated in the air and on the ground could be for crew info to action via FCOM etc.
EG a dragging brake/s on take off roll raises brake temp above 300 deg, after flight phase inhibit for this message is removed "DING" ecam msg HOT Brakes . I dont have an FCOM in front of me but I suspect the gear would be lowered until brake temp fell to an acceptable level
I will haveto dig out my notes on the Boeing wheel well detection but memory says single loop "graviner" detector ????
Last edited by Bolty McBolt; 5th Jan 2007 at 04:36.
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Just as I was equally surprised to find 757 and 737 brake temp readouts as an option.
I know that both Korean Air A330s and Air Canada's fleet do not have wheel well fire detection. Anyone know of a carrier operating the Airbus A330 or A340 with this option? Perhaps Northwest or BA?
I know that both Korean Air A330s and Air Canada's fleet do not have wheel well fire detection. Anyone know of a carrier operating the Airbus A330 or A340 with this option? Perhaps Northwest or BA?
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With that type of equipment installed, do you know if the ECAM requesting lo lower the gear in case of brake temp above 300C is still active, or the corresponding brake temp value is higher for such an ECAM ?
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The only info I have relating to brake temp as a system states that all brake temp info is sent to the BTMU for each braked pair. This amplifies the signal to the BSCU and the info is then displayed on ECAM via the normal routes. If brake fans are fitted (Virgin don't) then the BSCU will also light up HOT on the BRK FAN PB/SW. The brake fans only run on ground with inputs from the switch and the LGCIU in command.