B737 Winshield wiper operating limits.
Thread Starter
Joined: May 2001
Posts: 445
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From: Mumbai, INDIA
B737 Winshield wiper operating limits.
Whats the Speed beyond Windshield wipers will not operate.If there is Any.
Normally Wipers will be used during Takeoffs & Landings.
But If used at Cruise will they function with the Airloads.
regds
HAWK.
Normally Wipers will be used during Takeoffs & Landings.
But If used at Cruise will they function with the Airloads.
regds
HAWK.
Joined: Jan 2000
Posts: 860
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From: FL410
In our technical manuals there i no reference to any speed at which not to use the wipers any more.
Just curious why you would need to use them in the cruise? At the speed at which you're flying, the windshield will be dried by the air rushing around it anyway....
Just curious why you would need to use them in the cruise? At the speed at which you're flying, the windshield will be dried by the air rushing around it anyway....
Guest
Posts: n/a
Hi Hawk,
We never really need the wipers above about 210 kts (clean speed) because at higher speeds the rain is blown away. Also above 210 you are not usually at a critical phase of flight for looking out of the windows, ie near decision height or below. If it is raining then you are generally heads in flying on your instruments. I have tried to park them at higher speeds to stow them a bit lower down, but they usually end up worse perhaps because of the increased aerodynamic load. BTW they are so incredibly noisy and distracting most people prefer to leave them off unless the view is really impaired. Great pity they are withdrawing the rain repellent, that worked a treat and was silent.
S & L
We never really need the wipers above about 210 kts (clean speed) because at higher speeds the rain is blown away. Also above 210 you are not usually at a critical phase of flight for looking out of the windows, ie near decision height or below. If it is raining then you are generally heads in flying on your instruments. I have tried to park them at higher speeds to stow them a bit lower down, but they usually end up worse perhaps because of the increased aerodynamic load. BTW they are so incredibly noisy and distracting most people prefer to leave them off unless the view is really impaired. Great pity they are withdrawing the rain repellent, that worked a treat and was silent.
S & L
Joined: Aug 1998
Aviation Qualifications: ATPL
Posts: 6,623
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From: Ex-pat Aussie in the UK
BWahahaha 
Sorry, obviously you haven't used rain repellant, or the "Hydrophobic" stickers on our windscreens are just that - stickers only!
Rain repellant is ten times better than hydrophobic screens!
Sorry, obviously you haven't used rain repellant, or the "Hydrophobic" stickers on our windscreens are just that - stickers only!
Rain repellant is ten times better than hydrophobic screens!
Joined: Jan 2001
Posts: 28
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From: UK
One point to watch out for, the motors on the 2/3/4/500 have overheat switches in them, if they are used for extended periods on dry(ish) windscreens they can get too hot and cut out. They do self reset after a cooling down period. About the time we get called out to "Operational check carried out, No Fault Found" Doh!
Joined: Nov 2000
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Oh yes, we’ve had some trouble with the 737NG wiper. Modified units are doing better. Out of curiosity, anyone know if any airplane (possibly smaller airplanes) use compressed air directed towards the windshield, instead of wind-shield wipers? I would guess in combination with rain repellant.
I’m not aware of any myself, but a colleague indicated some airplane did, without being able to confirm which type of airplane.
I’m not aware of any myself, but a colleague indicated some airplane did, without being able to confirm which type of airplane.
Per Ardua ad Astraeus
Joined: Mar 2000
Posts: 18,575
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From: UK
English Electric (BAC) Lightning interceptor used HP compressor air via a fish tail onto the base of the windscreen. Most effective unless you were the poor QFI in the right hand seat of a trainer when the student bottled out in a strong crosswind and rain 'cos the R/H screen did not have it!
I know..............
I know..............
Joined: Aug 2002
Posts: 40
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From: East Coast
The Next Gen wiper motors have overheat switches in them as well. There was a modification done on them a couple of years back. The mod wasn't to the motors (at least ours wasn't), but thw iring associated was modified.
Joined: Mar 2002
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From: N/A
Boeshield
Is Boeshield really used as rain repellent? I'm an avid cyclist (mountain and road), and Boeshield T-9 lube is the best there is. I use it to lube the chain and cables as well as a frame polish/protectant.
-WN
-WN
