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Window Heat - Switched Of - When

HAWK21M From India, joined Jan 2001, 31201 posts, RR: 58
Posted (5 months 4 days 12 hours ago) and read 2576 times:

Another SOP is B737...Window heat switched off as part of post shutdown checks during transit halts....On the B757 it stays on throughout until the last flight of the day.
How is it on the other types & at other places.

Think of the brighter side!

13 replies: All unread, jump to last

Dogbreath From United Kingdom, joined Mar 2008, 236 posts, RR: 0
Reply 1, posted (5 months 3 days 23 hours ago) and read 2425 times:

I currently fly the B737-800 and we keep our Window Heat ON during turnarounds. We only select it OFF after the last sector and final shutdown checks.
This was the same on the B747, which I flew before the B738.

Truth, Honour, Loyalty

b78710 From United Kingdom, joined Mar 2006, 337 posts, RR: 0
Reply 2, posted (5 months 3 days 13 hours ago) and read 2294 times:

We have no procedure to deselect it on the 744, though I usually do on layovers or if its raining and steaming away.

deselection is accompanied by a status message so no chance of it being left off.

our 340's i never touch as its automatically selected off on the ground

N243NW From United States of America, joined Jul 2003, 1491 posts, RR: 21
Reply 3, posted (5 months 3 days 13 hours ago) and read 2275 times:

Our 757/767 SOP is to turn window heat off after each flight. It's in the parking checklist.

TCAS SYSTEM TEST OKAY.

Acey559 From United States of America, joined Jan 2007, 1337 posts, RR: 2
Reply 4, posted (5 months 3 days 5 hours ago) and read 2170 times:

On the Embraer 145 we select it on as part of the before takeoff check and off after we clear the runway. Another airline flying the same aircraft turns it on right after engine start. A lot just depends on the airline procedure.

roswell41 From United States of America, joined Aug 2001, 576 posts, RR: 1
Reply 5, posted (5 months 3 days 3 hours ago) and read 2141 times:

On the A320, window and pitot/probe heat is automatically controlled. You can turn it on if you need to melt snow on the windscreen while parked at the gate.

HAWK21M From India, joined Jan 2001, 31201 posts, RR: 58
Reply 6, posted (5 months 3 days 1 hour ago) and read 2092 times:

Quoting Acey559 (Reply 4):
A lot just depends on the airline procedure.

Exactly why the OP was made....to get to know the SOPs worldwide and its thought behind it being followed.

Think of the brighter side!

suprazachair From Northern Mariana Islands, joined Feb 2004, 632 posts, RR: 0
Reply 7, posted (4 months 3 weeks 5 days 11 hours ago) and read 1685 times:

On the dash, our procedure is windshield heat to "warm up" during the before taxi flow, and back off as part of the parking flow. After 30 seconds in warm-up it is switched to "norm" if taxiing/taking off into icing conditions.

highflyer9790 From United States of America, joined Jul 2005, 1236 posts, RR: 0
Reply 8, posted (4 months 3 weeks 5 days 6 hours ago) and read 1631 times:

on the CRJ our window heat stays on from first flight of the day until the terminator.

Highlfyer

Professional people mover. A to B. CL-65 Type; CFI/CFII/MEI/AGI/IGI

JBirdAV8r From United States of America, joined Jun 2001, 4459 posts, RR: 22
Reply 9, posted (4 months 3 weeks 5 days 5 hours ago) and read 1607 times:

Quoting highflyer9790 (Reply 8):
on the CRJ our window heat stays on from first flight of the day until the terminator.

Highlfyer

In the summer months at my airline, we turn it off in the shutdown flow if the OAT was over 26C...lest we get the windshield heat caution messages on the taxi-out. It goes back on in the before takeoff checklist.

If it's particularly hot, we can take off with the windshield heat OFF as long as we put it on in the after takeoff checks.

I got my head checked--by a jumbo jet

HAWK21M From India, joined Jan 2001, 31201 posts, RR: 58
Reply 10, posted (4 months 3 weeks 3 days 20 hours ago) and read 1414 times:

Quoting JBirdAV8r (Reply 9):
In the summer months at my airline, we turn it off in the shutdown flow if the OAT was over 26C...lest we get the windshield heat caution messages on the taxi-out. It goes back on in the before takeoff checklist.

Wouldn't the WHCU ensure the heat to the windshield is modulated to prevent an overheat.

Think of the brighter side!

JBirdAV8r From United States of America, joined Jun 2001, 4459 posts, RR: 22
Reply 11, posted (4 months 3 weeks 3 days 12 hours ago) and read 1378 times:

Quoting HAWK21M (Reply 10):
Wouldn't the WHCU ensure the heat to the windshield is modulated to prevent an overheat.

In theory, yes--it's designed to do just that. But in practice when the OAT is very high (generally >30C) and we're on the ground, the windshield temperature controllers have difficulty controlling the temperature and we'll get a caution message (L or R WSHLD HEAT). Sometimes simply recycling the windshield heat to OFF and then back to LOW will clear the error, but often times it'll come right back up again. So we try to limit the time that windshield heat is on when we're on the ground.

During the extremely hot days this past summer it wasn't uncommon to see ice bags on the windows of some CRJs.

I got my head checked--by a jumbo jet

HAWK21M From India, joined Jan 2001, 31201 posts, RR: 58
Reply 12, posted (4 months 3 weeks 3 days 12 hours ago) and read 1370 times:

Quoting JBirdAV8r (Reply 11):
So we try to limit the time that windshield heat is on when we're on the ground.

What would be the cutoff temp of the window heat approx......

Think of the brighter side!

JBirdAV8r From United States of America, joined Jun 2001, 4459 posts, RR: 22
Reply 13, posted (4 months 3 weeks 3 days 9 hours ago) and read 1339 times:

Quoting HAWK21M (Reply 12):
What would be the cutoff temp of the window heat approx......

I'm not sure what the overheat detection tolerance is....I'll see if I can find something that would tell me. The LOW setting regulates windshield/window temperature to 24C, and the HIGH setting (we only use for as long as we need it) maintains the windshields at 41C and windows at 24C.

When we put the windshield heat in OFF/RESET, it resets the overheat detection logic.

I got my head checked--by a jumbo jet

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