Originally Posted by joethepilot
(Post 749974)
I have to admit I didn't read the whole thread... so this may have been brought up earlier... but The FAR's say that you can use a stop way to balance your runway length for an abort (25.109). I.E. the EMAS ACTUAL length of 100 feet adds 1000 feet of "runway" length that can be used in the accelerate stop distance calculation. So if this abort was indeed initiated right at V1, the expected outcome would have been to end up in the EMAS.
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Yeager Airport save 6th in U.S. for emergency-stop ... - News - The Charleston Gazette - West Virginia News and Sports
January 20, 2010 Yeager Airport save 6th in U.S. for emergency-stop system 33 people were aboard when US Airways Express jet skidded off end of runway http://www.wvgazette.com/mediafiles/...0120203342.jpg Chris Dorst Skid marks that extend nearly 1,000 feet down the main runway at Yeager Airport end in the crushed concrete blocks of an Engineered Materials Arresting System overlooking downtown Charleston. Sorry for the dumb question, but why are there 1000 ft of skid marks? A/SKID isn't MELable, or is it? But if it was MEL'd then V1 would have been reduced. And if it was functional, it would have prevented skidding for 1000 feet, right? Not going anywhere with this other than thinking there shouldn't have been skid marks. |
Maybe the CA though the brakes weren't working as they should and used emergency pneumatic brakes for which antiskid doesn't work?
/don't mean to speculate, have forgotten most of my CRJ systems and might be confusing Citation stuff |
Anti-skid is disable below a certain speed too right?
USMCFLYR |
Originally Posted by AirportEngineer
(Post 750781)
EMAS is specifically exluded from ASDA calculations. It is not stopway.
Originally Posted by robthree
(Post 750911)
Yeager Airport save 6th in U.S. for emergency-stop ... - News - The Charleston Gazette - West Virginia News and Sports
January 20, 2010 Yeager Airport save 6th in U.S. for emergency-stop system 33 people were aboard when US Airways Express jet skidded off end of runway http://www.wvgazette.com/mediafiles/...0120203342.jpg Chris Dorst Skid marks that extend nearly 1,000 feet down the main runway at Yeager Airport end in the crushed concrete blocks of an Engineered Materials Arresting System overlooking downtown Charleston. Sorry for the dumb question, but why are there 1000 ft of skid marks? A/SKID isn't MELable, or is it? But if it was MEL'd then V1 would have been reduced. And if it was functional, it would have prevented skidding for 1000 feet, right? Not going anywhere with this other than thinking there shouldn't have been skid marks. |
Originally Posted by USMCFLYR
(Post 750953)
Anti-skid is disable below a certain speed too right?
USMCFLYR Just b/c antisid is working doesn't mean their won't be skid marks. It just pulses the brakes. At some point the wheel is not rotating but still moving resulting in a skid mark. Once again, they could not have aborted due to an a/skid message as all Caution messages are disabled above 70%ish N1 on the ground. |
Originally Posted by FlyingNasaForm
(Post 751146)
10kts.
Once again, they could not have aborted due to an a/skid message as all Caution messages are disabled above 70%ish N1 on the ground. |
Anti-Skid
Here is some information on the CRJ antiskid system:
Hydro Aire Mark III Brake Control System 14 CFR 25.735 Brakes and Braking Systems (See pg. 422). AC-25.735-1 Brakes and Braking Sytems Certification Tests and Analysis (See pg. 9). The "accelerate-stop/accelerate-go vs. balanced field length" confusion arises because most transport category operators use balanced field length calculations located on runway analysis reports. The operator's authorization to use this method is located in their individual operations specifications. The best definition of "balanced field length" is located in the Pilot Guide to Takeoff Safety. winglet |
Originally Posted by B00sted
(Post 751152)
That's not true. Not all caution messages are inhibited. Anti skid is not inhibited.
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Originally Posted by BoilerUP
(Post 749508)
Just curious...how long was the runway? Max braking and TRs used during the abort?
One thing I NEVER worried about in the CRJ-200 was stopping...those brakes are MASSIVE. |
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