GeographyFlyer
Topic Author
Posts: 4
Joined: Tue Dec 19, 2017 6:59 pm

Boeing 777 Wiper limit speed

Sat Dec 29, 2018 10:51 pm

Hello,

does anyone of you know what´s the maximum allowable speed(I assume it´s IAS) for wiper operation on Boeing 777? And I would also like to know where to find these things.

Thank you in advance, GeographyFlyer.
 
User avatar
janders
Posts: 572
Joined: Mon Dec 11, 2017 4:27 pm

Re: Boeing 777 Wiper limit speed

Sat Dec 29, 2018 11:00 pm

Boeing aircraft usually don't have such limitation.

viewtopic.php?t=768791

Wipers be rather useless at higher speeds anyways since wind blows water off anyhow.
"We make war that we may live in peace." -- Aristotle
 
stratclub
Posts: 700
Joined: Fri Jan 05, 2018 10:38 pm

Re: Boeing 777 Wiper limit speed

Sun Dec 30, 2018 12:12 am

At cruise they are flying above the weather...............
 
BravoOne
Posts: 2988
Joined: Fri Apr 12, 2013 2:27 pm

Re: Boeing 777 Wiper limit speed

Sun Dec 30, 2018 2:46 pm

The windows have a hydrophobic coating which dissipates most, if not all of the water. Wipers actually are not much of a factor in enhancing viz except while taxing.
 
thepinkmachine
Posts: 304
Joined: Tue Apr 28, 2015 4:43 pm

Re: Boeing 777 Wiper limit speed

Sun Dec 30, 2018 5:26 pm

Well, they do help, especially in tropical wx. I’ve wondered the same - all the Airbuses have a hard limit for wiper speed, but apparently there’s no published limit on the Boeing.
 
747Whale
Posts: 267
Joined: Fri Dec 07, 2018 7:41 pm

Re: Boeing 777 Wiper limit speed

Sun Dec 30, 2018 6:47 pm

Not a 777, but some years ago I was involved in moving a fleet of older 747 Classics. The chief pilot was flying on one particular trip and at top of descent, for reasons known only to him, he turned on the wiper. It rapidly departed the airplane. We named a new V-speed after him, for the wiper. It was an inside joke.
 
seven47
Posts: 4
Joined: Sun Feb 02, 2014 2:17 am

Re: Boeing 777 Wiper limit speed

Mon Dec 31, 2018 12:36 pm

Good ol' P-Dub!....
 
747Whale
Posts: 267
Joined: Fri Dec 07, 2018 7:41 pm

Re: Boeing 777 Wiper limit speed

Mon Dec 31, 2018 5:18 pm

Vpb
 
acmx
Posts: 13
Joined: Mon Aug 13, 2018 7:49 pm

Re: Boeing 777 Wiper limit speed

Mon Dec 31, 2018 5:53 pm

The mechanics had some jokes about it too...

Was there a listed max speed on the classic? I remember some talk about one but it was probably made up.
 
stratclub
Posts: 700
Joined: Fri Jan 05, 2018 10:38 pm

Re: Boeing 777 Wiper limit speed

Mon Dec 31, 2018 10:13 pm

Vwne
 
747Whale
Posts: 267
Joined: Fri Dec 07, 2018 7:41 pm

Re: Boeing 777 Wiper limit speed

Tue Jan 01, 2019 12:43 am

acmx wrote:

Was there a listed max speed on the classic?


Not until he turned it on.

There weren't any published numbers, but the question came up from time to time. I remember seeing a quick flash by the left window and it was gone, but I didn't realize it was the wiper at first; it disappeared quickly.
 
User avatar
Berevoff
Posts: 182
Joined: Fri Jun 29, 2018 3:19 pm

Re: Boeing 777 Wiper limit speed

Tue Jan 01, 2019 1:03 am

Does anyone have any experience with the Gulfstream bleed air method for clearing the windshield? Is it better/worse than wipers?
 
ChrisKen
Posts: 642
Joined: Tue Aug 05, 2008 11:15 pm

Re: Boeing 777 Wiper limit speed

Tue Jan 01, 2019 1:45 am

Berevoff wrote:
Does anyone have any experience with the Gulfstream bleed air method for clearing the windshield? Is it better/worse than wipers?

Bleed air? I though the "Surface Seal" water-repellent coating did the job combined with normal air flow on the G550 (maybe G660 too).
 
BravoOne
Posts: 2988
Joined: Fri Apr 12, 2013 2:27 pm

Re: Boeing 777 Wiper limit speed

Tue Jan 01, 2019 3:00 am

I have a little experience with the G550 and don't recall any issues. The DC8 did not have wipers and while there were negative remarks on that system, I believe it prevailed until the end of production. The Boeing Rainbow system had mixed results on the 707/727 FWIW.
 
User avatar
Berevoff
Posts: 182
Joined: Fri Jun 29, 2018 3:19 pm

Re: Boeing 777 Wiper limit speed

Tue Jan 01, 2019 2:44 pm

ChrisKen wrote:
Berevoff wrote:
Does anyone have any experience with the Gulfstream bleed air method for clearing the windshield? Is it better/worse than wipers?

Bleed air? I though the "Surface Seal" water-repellent coating did the job combined with normal air flow on the G550 (maybe G660 too).


I thought I remember reading the G-VI had some sort of bleed air system for keeping the windshield clear?
 
BravoOne
Posts: 2988
Joined: Fri Apr 12, 2013 2:27 pm

Re: Boeing 777 Wiper limit speed

Tue Jan 01, 2019 3:03 pm

Berevoff wrote:
ChrisKen wrote:
Berevoff wrote:
Does anyone have any experience with the Gulfstream bleed air method for clearing the windshield? Is it better/worse than wipers?

Bleed air? I though the "Surface Seal" water-repellent coating did the job combined with normal air flow on the G550 (maybe G660 too).


I thought I remember reading the G-VI had some sort of bleed air system for keeping the windshield clear?


What is a G-VI?
 
ChrisKen
Posts: 642
Joined: Tue Aug 05, 2008 11:15 pm

Re: Boeing 777 Wiper limit speed

Tue Jan 01, 2019 3:10 pm

Berevoff wrote:
ChrisKen wrote:
Berevoff wrote:
Does anyone have any experience with the Gulfstream bleed air method for clearing the windshield? Is it better/worse than wipers?

Bleed air? I though the "Surface Seal" water-repellent coating did the job combined with normal air flow on the G550 (maybe G660 too).


I thought I remember reading the G-VI had some sort of bleed air system for keeping the windshield clear?


Done some digging on the G650 as far as I can tell the flightdeck and cabin windows are heated electrically (AD/TAT probes & EVS window too), a hydrophobic coating on the windshields in lieu of wipers/blowers.
Only bleed air items with regards to rain & ice protection are for the wing and engine/cowl anti-ice.


G-VI = Gulfstream 6 aka G650 Mr BravoOne
 
User avatar
Berevoff
Posts: 182
Joined: Fri Jun 29, 2018 3:19 pm

Re: Boeing 777 Wiper limit speed

Tue Jan 01, 2019 5:47 pm

BravoOne wrote:
Berevoff wrote:
ChrisKen wrote:
Bleed air? I though the "Surface Seal" water-repellent coating did the job combined with normal air flow on the G550 (maybe G660 too).


I thought I remember reading the G-VI had some sort of bleed air system for keeping the windshield clear?


What is a G-VI?


Gulfstream GVI (its official model designation). Its one of the most famous business jets that exists today. Its manufactured by Gulfstream Aerospace out of Savannah Georgia. They are one of the leading business jet manufacturers.

Or maybe you're just being unnecessarily pedantic.
 
User avatar
Berevoff
Posts: 182
Joined: Fri Jun 29, 2018 3:19 pm

Re: Boeing 777 Wiper limit speed

Tue Jan 01, 2019 5:48 pm

ChrisKen wrote:
Berevoff wrote:
ChrisKen wrote:
Bleed air? I though the "Surface Seal" water-repellent coating did the job combined with normal air flow on the G550 (maybe G660 too).


I thought I remember reading the G-VI had some sort of bleed air system for keeping the windshield clear?


Done some digging on the G650 as far as I can tell the flightdeck and cabin windows are heated electrically (AD/TAT probes & EVS window too), a hydrophobic coating on the windshields in lieu of wipers/blowers.
Only bleed air items with regards to rain & ice protection are for the wing and engine/cowl anti-ice.


G-VI = Gulfstream 6 aka G650 Mr BravoOne


Interesting thanks for the clarification. I don't know how I came up with that...I could have sworn I heard it somewhere! Is that type of system even a thing?
 
ChrisKen
Posts: 642
Joined: Tue Aug 05, 2008 11:15 pm

Re: Boeing 777 Wiper limit speed

Tue Jan 01, 2019 5:51 pm

Maybe some convoluted old school system where the windshield heat was provided by an 'old style' blowing demister (like cars) where the heat was weirdly provided by bleed air? :confused:

I can't see where it'd be used on a electrically heated windscreen, either with wipers or hydrophobic coating.
 
stratclub
Posts: 700
Joined: Fri Jan 05, 2018 10:38 pm

Re: Boeing 777 Wiper limit speed

Tue Jan 01, 2019 6:20 pm

I remember reading years ago about an aircraft that did use bleed air for cockpit window TAI. Just can't remember what plane it was.
 
seven47
Posts: 4
Joined: Sun Feb 02, 2014 2:17 am

Re: Boeing 777 Wiper limit speed

Tue Jan 01, 2019 7:47 pm

747Whale wrote:
Vpb


I never heard the Vpb joke. I plan on using that forever!
 
GalaxyFlyer
Posts: 1948
Joined: Fri Jan 01, 2016 4:44 am

Re: Boeing 777 Wiper limit speed

Tue Jan 01, 2019 9:38 pm

stratclub wrote:
I remember reading years ago about an aircraft that did use bleed air for cockpit window TAI. Just can't remember what plane it was.


The original Citations and Lears did, but that’s 40 years ago.


GF
 
BravoOne
Posts: 2988
Joined: Fri Apr 12, 2013 2:27 pm

Re: Boeing 777 Wiper limit speed

Tue Jan 01, 2019 10:53 pm

Berevoff wrote:
ChrisKen wrote:
Berevoff wrote:

I thought I remember reading the G-VI had some sort of bleed air system for keeping the windshield clear?


Done some digging on the G650 as far as I can tell the flightdeck and cabin windows are heated electrically (AD/TAT probes & EVS window too), a hydrophobic coating on the windshields in lieu of wipers/blowers.
Only bleed air items with regards to rain & ice protection are for the wing and engine/cowl anti-ice.


G-VI = Gulfstream 6 aka G650 Mr BravoOne


Interesting thanks for the clarification. I don't know how I came up with that...I could have sworn I heard it somewhere! Is that type of system even a thing?


It helps when you ask a question and you can at least identify the airplane you are talking about. FWIW the G350/450/550 all come under a common type rating designated as the Gulfstream V. The G650 is a separate type and I have never seen it designated a GVI, certainly not by Gulfstream or FSI.

Your dismissive attitude will not serve you well in aviation, especially when asking questions from others.
 
User avatar
Berevoff
Posts: 182
Joined: Fri Jun 29, 2018 3:19 pm

Re: Boeing 777 Wiper limit speed

Wed Jan 02, 2019 12:48 am

BravoOne wrote:
Berevoff wrote:
ChrisKen wrote:

Done some digging on the G650 as far as I can tell the flightdeck and cabin windows are heated electrically (AD/TAT probes & EVS window too), a hydrophobic coating on the windshields in lieu of wipers/blowers.
Only bleed air items with regards to rain & ice protection are for the wing and engine/cowl anti-ice.


G-VI = Gulfstream 6 aka G650 Mr BravoOne


Interesting thanks for the clarification. I don't know how I came up with that...I could have sworn I heard it somewhere! Is that type of system even a thing?


It helps when you ask a question and you can at least identify the airplane you are talking about. FWIW the G350/450/550 all come under a common type rating designated as the Gulfstream V. The G650 is a separate type and I have never seen it designated a GVI, certainly not by Gulfstream or FSI.

Your dismissive attitude will not serve you well in aviation, especially when asking questions from others.


Every single person knew exactly what aircraft I was referring to when I asked. Being petty and nitpicky about such things makes you look like a know it all among colleagues.

When someone says G-VI, G-6, Gulfstream 6, G650, etc literally everyone knows what aircraft is being referenced. The official FAA designation of the type is GVI just so you're aware.

You're the "Actually..." guy in real life.
 
WPvsMW
Posts: 1482
Joined: Thu Mar 23, 2017 7:30 pm

Re: Boeing 777 Wiper limit speed

Wed Jan 02, 2019 1:07 am

Berewolf... what's your avatar, and the heraldry? Another short tangent in a Vpb thread ...
 
ChrisKen
Posts: 642
Joined: Tue Aug 05, 2008 11:15 pm

Re: Boeing 777 Wiper limit speed

Wed Jan 02, 2019 1:24 am

BravoOne wrote:
It helps when you ask a question and you can at least identify the airplane you are talking about. The G650 is a separate type and I have never seen it designated a GVI, certainly not by Gulfstream or FSI.

Your dismissive attitude will not serve you well in aviation, especially when asking questions from others.


You may want to check facts before gobbing off, Skygod syndrome serves you even less well in aviation..

Here's the type certificate. Care to take a guess at which designator Gulfstream used for the G650?

Drumroll........GVI "Gulfstream GVI"
http://rgl.faa.gov/Regulatory_and_Guida ... _Rev_4.pdf
 
ChrisKen
Posts: 642
Joined: Tue Aug 05, 2008 11:15 pm

Re: Boeing 777 Wiper limit speed

Wed Jan 02, 2019 1:56 am

WPvsMW wrote:
Berewolf... what's your avatar, and the heraldry?.

Looks like the flag of Serbia
 
Max Q
Posts: 6963
Joined: Wed May 09, 2001 12:40 pm

Re: Boeing 777 Wiper limit speed

Wed Jan 02, 2019 4:13 am

stratclub wrote:
I remember reading years ago about an aircraft that did use bleed air for cockpit window TAI. Just can't remember what plane it was.



You may be thinking about the Convair 880 and 990, both of which used bleed air in lieu of windscreen wipers
The best contribution to safety is a competent Pilot.
 
kabq737
Posts: 594
Joined: Wed Apr 15, 2015 3:06 am

Re: Boeing 777 Wiper limit speed

Wed Jan 02, 2019 5:07 am

Max Q wrote:
stratclub wrote:
I remember reading years ago about an aircraft that did use bleed air for cockpit window TAI. Just can't remember what plane it was.



You may be thinking about the Convair 880 and 990, both of which used bleed air in lieu of windscreen wipers

If you don’t mind me asking how did that work? Was it just channeled at a high rate across the windshield? Thanks for the info in advance.
320, 321, 333, 733, 73G, 738, 739, 744, 752, 763, 764, 772, 789, C208, CR7, CR9, BE20, MD88, MD90, E70, E75, E90, TRIM, SEEKER, C172N, C172R, C172S, DA40
 
User avatar
fr8mech
Posts: 7434
Joined: Mon Sep 26, 2005 9:00 am

Re: Boeing 777 Wiper limit speed

Wed Jan 02, 2019 5:22 am

The DC-8 used bleed air for windscreen clearance instead of windshield wipers.

It did not use bleed air for TAI. It used a heated window, just like most modern aircraft.

And, just for reference, the max speed for windshield wipers on our A300'a is 230 KIAS.

None of our Boeings or McBoeings have a listed max speed.
When seconds count...the police are minutes away.
Unless it's expressly prohibited, it's allowed.
You are not entitled to a public safe space.
 
User avatar
Starlionblue
Posts: 18825
Joined: Fri Feb 27, 2004 9:54 pm

Re: Boeing 777 Wiper limit speed

Wed Jan 02, 2019 5:27 am

fr8mech wrote:
The DC-8 used bleed air for windscreen clearance instead of windshield wipers.

It did not use bleed air for TAI. It used a heated window, just like most modern aircraft.

And, just for reference, the max speed for windshield wipers on our A300'a is 230 KIAS.

None of our Boeings or McBoeings have a listed max speed.


Same 230 KIAS limit on the A330 and A350.

I did hear a story of a junior pilot who decided to try out the wiper in the cruise on the A330. It departed the aircraft. No word on the severity of the subsequent verbal beating.
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
User avatar
TOGA10
Posts: 231
Joined: Thu Dec 01, 2016 8:49 am

Re: Boeing 777 Wiper limit speed

Wed Jan 02, 2019 10:10 am

Starlionblue wrote:
fr8mech wrote:
The DC-8 used bleed air for windscreen clearance instead of windshield wipers.

It did not use bleed air for TAI. It used a heated window, just like most modern aircraft.

And, just for reference, the max speed for windshield wipers on our A300'a is 230 KIAS.

None of our Boeings or McBoeings have a listed max speed.


Same 230 KIAS limit on the A330 and A350.

I did hear a story of a junior pilot who decided to try out the wiper in the cruise on the A330. It departed the aircraft. No word on the severity of the subsequent verbal beating.

Same for the A320 family, 230kts. Never really liked the wipers though, bit noisy and not very good at wiping. My car wipers do a better job, but I usually drive at a slower speed ;-).
Love flying, hate the alarm at 3 in the morning, love watching the sun rise at 5:30. It's all about compromises.
 
BravoOne
Posts: 2988
Joined: Fri Apr 12, 2013 2:27 pm

Re: Boeing 777 Wiper limit speed

Wed Jan 02, 2019 11:23 am

ChrisKen wrote:
BravoOne wrote:
It helps when you ask a question and you can at least identify the airplane you are talking about. The G650 is a separate type and I have never seen it designated a GVI, certainly not by Gulfstream or FSI.

Your dismissive attitude will not serve you well in aviation, especially when asking questions from others.


You may want to check facts before gobbing off, Skygod syndrome serves you even less well in aviation..

Here's the type certificate. Care to take a guess at which designator Gulfstream used for the G650?

Drumroll........GVI "Gulfstream GVI"
http://rgl.faa.gov/Regulatory_and_Guida ... _Rev_4.pdf


Sorry for the confusion. For the record, I do not have a G650 type rating, just the GV with 550 & 450 differences. I believe the Gulfstream 650 is shown as Gulf f650 on the Airman Cert and that's where this story began.
 
User avatar
tjwgrr
Posts: 2314
Joined: Fri Mar 24, 2000 4:09 am

Re: Boeing 777 Wiper limit speed

Wed Jan 02, 2019 4:59 pm

ChrisKen wrote:
BravoOne wrote:
It helps when you ask a question and you can at least identify the airplane you are talking about. The G650 is a separate type and I have never seen it designated a GVI, certainly not by Gulfstream or FSI.

Your dismissive attitude will not serve you well in aviation, especially when asking questions from others.


You may want to check facts before gobbing off, Skygod syndrome serves you even less well in aviation..

Here's the type certificate. Care to take a guess at which designator Gulfstream used for the G650?

Drumroll........GVI "Gulfstream GVI"
http://rgl.faa.gov/Regulatory_and_Guida ... _Rev_4.pdf


Now that there's the new G600, I wonder what the FAA will do?....... But I digress.
Direct KNOBS, maintain 2700' until established on the localizer, cleared ILS runway 26 left approach.
 
User avatar
trpmb6
Posts: 1771
Joined: Thu Apr 19, 2018 5:45 pm

Re: Boeing 777 Wiper limit speed

Wed Jan 02, 2019 5:30 pm

tjwgrr wrote:

Now that there's the new G600, I wonder what the FAA will do?....... But I digress.


Similar to what they did for the rest of Gulfstream models would be my guess. http://www.airweb.faa.gov/Regulatory_an ... Rev_49.pdf

That's the A12EA TCDS

Covers models:

Gulfstream
G-1159
G-1159A
G-1159B
G-IV
GV
GV-SP
GIV-X

Also, the G-VI TCDS posted up thread was an early revision; the lastest one is revision 14: http://www.airweb.faa.gov/Regulatory_an ... Rev_14.pdf
 
User avatar
Berevoff
Posts: 182
Joined: Fri Jun 29, 2018 3:19 pm

Re: Boeing 777 Wiper limit speed

Wed Jan 02, 2019 6:49 pm

WPvsMW wrote:
Berewolf... what's your avatar, and the heraldry? Another short tangent in a Vpb thread ...


Its just the flag of Serbia where my grandparents were from.
 
WPvsMW
Posts: 1482
Joined: Thu Mar 23, 2017 7:30 pm

Re: Boeing 777 Wiper limit speed

Wed Jan 02, 2019 8:39 pm

Thanks. A striking design.
 
hawjl
Posts: 3
Joined: Sun Jan 06, 2019 8:12 am

Re: Boeing 777 Wiper limit speed

Mon Jan 07, 2019 4:17 am

no limit. however funny fact is one time I turnt on the wiper not even in high speed(about 210 kts) then the wiper stuck in the 1/3 position until landing
 
flapsdown40
Posts: 49
Joined: Thu Aug 25, 2016 11:41 am

Re: Boeing 777 Wiper limit speed

Sat Jan 12, 2019 3:29 am

BravoOne wrote:
The windows have a hydrophobic coating which dissipates most, if not all of the water.


Is it like Rain X for car windshields?
I'm already insane but I'm not crazy!

Who is online

Users browsing this forum: No registered users and 22 guests

Popular Searches On Airliners.net

Top Photos of Last:   24 Hours  •  48 Hours  •  7 Days  •  30 Days  •  180 Days  •  365 Days  •  All Time

Military Aircraft Every type from fighters to helicopters from air forces around the globe

Classic Airliners Props and jets from the good old days

Flight Decks Views from inside the cockpit

Aircraft Cabins Passenger cabin shots showing seat arrangements as well as cargo aircraft interior

Cargo Aircraft Pictures of great freighter aircraft

Government Aircraft Aircraft flying government officials

Helicopters Our large helicopter section. Both military and civil versions

Blimps / Airships Everything from the Goodyear blimp to the Zeppelin

Night Photos Beautiful shots taken while the sun is below the horizon

Accidents Accident, incident and crash related photos

Air to Air Photos taken by airborne photographers of airborne aircraft

Special Paint Schemes Aircraft painted in beautiful and original liveries

Airport Overviews Airport overviews from the air or ground

Tails and Winglets Tail and Winglet closeups with beautiful airline logos