"Brakes Hot" Ecam Msg
 

That one is for Airbus since a brake temp has reached 300C.
And it could come up on the ground as well as in flight.

Is there an equivalent message on a Boeing product ?
Are the brakes temp always monitored, and visible on request ?
How works the "WHEEL WELL FIRE" EICAS ?

Thanks

Quick answer is yes and yes. On the 777, brake temperatures can be monitored on the "gear" synoptic displayed on one of the DU's. Not sure of anything similar on 737's or the likes though.

Airbus doesn't use a wheel well fire detection system, so therefore use the brake temp as a limitation, while Boeing use a wheel well fire detection system so therefore have no brake temp limitation.

The 747 has brake temp indicators.

All Boeing aircraft with the exception of the inherited MD-95 (717) have wheel well fire detection systems. Widebodies include brake temp monitoring.

717 & MD-90 - Brake Temp Monitoring - Gauge on MD-90

727, 737 & 757 - Wheel well fire detection system. No Brake Temp readout***

747-all models, 767 & 777 - Both wheel well fire detection system & Brake Temp Monitoring

No aircraft (Airbus or Boeing/McD) have wheel well fire suppression installed. Usual procedure is to hang your feet out to cool.

***An Option - see more enlightened posts below.

no money no funny
 

The 737NG can have brake temperature monitoring, if you pay extra for it :}

...but please say ABS is standard, right?:\

757's can have a temp readout (we have, as did british airways). It's a cutomer option and shows on Eicas together with hyd press, oxy press, apu rpm etc. It shows numbers in eight boxes ranging from 0 to 10. The numbers turn red when passing a certain value.

On a more serious note than my last post...I have long been aware of the hang your feet out to cool requirement for certain fast-turnaround conditions but despite having ridden in the back of quite some number of fast turnaround flights, I have never been aware of the undercarriage being relowered after the initial climbout. To take just one type, what percentage of fast turnaround 737 landings are heavy braked and what percentage of those go out again in under say 53 minutes? Does the 53 mins apply to NG's? Any ideas?

I would be interested if you have these values.

Also, if you have some documentation on WHEEL WELL FIRE detection.
How many detectors by wheel bay ?
What's the conditions to trigger a warning ?
Can a high brake temp trigger a fire warning as well ?

Thanks

747 Classic.

One continuous fire detector loop is installed with detector elements in each of the main landing gear wheel wells. A fire or overheat condition in one of the wheel wells will initiate a fire warning.
The detector system is similar to the nacelle and APU fire detection systems except there is no discriminator. With an electrical short (detector failure) or a fire condition causing a short, the warning will be locked on. With a fire condition causing an open loop, the wheel well fire warning light will remain illuminated but will extinguish when the overheat condition has ceased.
With an open circuit in the detector loop the system will not respond to test. The brake temperature monitor module on the F/E’s panel provides a means of monitoring the wheels for an overheat condition.

I have some Boeing notes somewhere which say that hot brakes will not generate a fire warning.

I stand corrected.
 

I was not aware of this and have not seen an NB Boeing so equipped here in the states - yet.
I thank you both.


I am stating the obvious here.... the percentage would depend on load, airport served, weather and company SOPs. Regarding quick turn around capabilities, the 737 is among the best in the fleet.

Thank you .
Now, if, for any reason, after gear retraction, heat continues to built up to a certain value, would you have a checklist requesting to select gear down again ?

On the 330/340/380 they have wheel well fire detection, just the mini bus missed out as standard. I am not sure, it may even be an option for them.

Yes. On the classic the F/E will do a panel scan some time after TO which includes the brake temps, depending on the temp you may go into the alternate procedures and select the gear down to bring the temp within the normal range.

On glass A/C an EICAS/ECAM message would lead you to the QRH or procedure to put the gear down.

I don't think the A330/340 have wheel well fire detection, which is why they have the 300C limitation.

FCOM 1.26.58, Main landing gear fire and overheat detection & FCOM 3.02.26 MLG BAY FIRE DET FAULT, MLG BAY FIRE LOOP A(B) FAULT, MLG BAY FIRE IN FLIGHT, MLG BAY FIRE ON GROUND, still with 300 deg limit for takeoff.

Maybe your aircraft do not have them installed.

Cheers Zeke, You're right the 330/340 I flew didn't have it, I never would have thought wheel well fire detection was an option, you learn something new every day!

According to the 757 maintenance training manual, the figures go from 0 to 9 (not 10 as I mentioned earlier). This resembles a range from 0 to 690°C. There are three colors available on the lower EICAS display. When a brake reaches value "5" (or approx. 500°C) there is a color change, together with a "brake" light, next to the three greens and the "door" light. Every single brake has a temp probe and these 8 signals go to a brake monitoring computer. A photo with the blocks on the EICAS and the brake light: http://www.airliners.net/open.file/0529570/M/
If I have time I will look up the fire warning issue.

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 ?

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?