Sponsor Message:
Aviation Technical / Operations Forum
My Starred Topics | Profile | New Topic | Forum Index | Help | Search 
Window Heat - Switched Of - When  
User currently offlineHAWK21M From India, joined Jan 2001, 31702 posts, RR: 56
Posted (2 years 21 hours ago) and read 3714 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
 
User currently offlineDogbreath From United Kingdom, joined Mar 2008, 265 posts, RR: 0
Reply 1, posted (2 years 9 hours ago) and read 3563 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
User currently offlineb78710 From United Kingdom, joined Mar 2006, 344 posts, RR: 0
Reply 2, posted (1 year 12 months 4 days 23 hours ago) and read 3432 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


User currently offlineN243NW From United States of America, joined Jul 2003, 1640 posts, RR: 20
Reply 3, posted (1 year 12 months 4 days 22 hours ago) and read 3413 times:

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


B-52s don't take off. They scare the ground away.
User currently offlineAcey559 From United States of America, joined Jan 2007, 1544 posts, RR: 2
Reply 4, posted (1 year 12 months 4 days 14 hours ago) and read 3308 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.

User currently offlineroswell41 From United States of America, joined Aug 2001, 803 posts, RR: 1
Reply 5, posted (1 year 12 months 4 days 13 hours ago) and read 3279 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.

User currently offlineHAWK21M From India, joined Jan 2001, 31702 posts, RR: 56
Reply 6, posted (1 year 12 months 4 days 10 hours ago) and read 3230 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!
User currently offlinesuprazachair From Northern Mariana Islands, joined Feb 2004, 634 posts, RR: 0
Reply 7, posted (1 year 11 months 3 weeks 6 days 20 hours ago) and read 2823 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.

User currently offlinehighflyer9790 From United States of America, joined Jul 2005, 1241 posts, RR: 0
Reply 8, posted (1 year 11 months 3 weeks 6 days 16 hours ago) and read 2769 times:

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

Highlfyer



121
User currently offlineJBirdAV8r From United States of America, joined Jun 2001, 4491 posts, RR: 21
Reply 9, posted (1 year 11 months 3 weeks 6 days 15 hours ago) and read 2745 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
User currently offlineHAWK21M From India, joined Jan 2001, 31702 posts, RR: 56
Reply 10, posted (1 year 11 months 3 weeks 5 days 6 hours ago) and read 2552 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!
User currently offlineJBirdAV8r From United States of America, joined Jun 2001, 4491 posts, RR: 21
Reply 11, posted (1 year 11 months 3 weeks 4 days 22 hours ago) and read 2516 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
User currently offlineHAWK21M From India, joined Jan 2001, 31702 posts, RR: 56
Reply 12, posted (1 year 11 months 3 weeks 4 days 21 hours ago) and read 2508 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!
User currently offlineJBirdAV8r From United States of America, joined Jun 2001, 4491 posts, RR: 21
Reply 13, posted (1 year 11 months 3 weeks 4 days 18 hours ago) and read 2477 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
Top Of Page
Forum Index

Reply To This Topic Window Heat - Switched Of - When
Username:
No username? Sign up now!
Password: 


Forgot Password? Be reminded.
Remember me on this computer (uses cookies)
  • Tech/Ops related posts only!
  • Not Tech/Ops related? Use the other forums
  • No adverts of any kind. This includes web pages.
  • No hostile language or criticizing of others.
  • Do not post copyright protected material.
  • Use relevant and describing topics.
  • Check if your post already been discussed.
  • Check your spelling!
  • DETAILED RULES
Add Images Add SmiliesPosting Help

Please check your spelling (press "Check Spelling" above)


Similar topics:More similar topics...
Window Heat Inoperative? posted Mon May 31 2004 03:31:49 by Bio15
What Is "window Heat"? posted Mon Sep 1 2003 23:02:14 by FastFlyer
What Is The Purpose Of The Solid Red Window... posted Mon May 16 2011 13:55:20 by timmydasquirrel
Point Of The One Window On The 777F posted Sat May 9 2009 13:54:05 by N104UA
Why The Little Hole At The Bottom Of The Window? posted Tue Oct 17 2006 03:19:07 by Gh123
When Adding Or Removing Rows Of Seats posted Mon Dec 12 2005 00:19:29 by Monorail
C17A - What Is The Purpose Of This Window? posted Tue Jul 5 2005 05:29:30 by ZKEYE
Black Area Infront Of The Cockpit Window posted Thu Mar 10 2005 04:37:04 by NWADC9
Flow Window? Meaning Of? posted Thu Oct 21 2004 23:22:25 by Wardialer
Approach Speed When Props Are In Front Of Jets posted Sat Oct 19 2002 20:18:29 by Airbus Lover

Sponsor Message:
Printer friendly format