Originally Posted by Tummy
(Post 1772396)
In my fleet aircraft, the AV-8B, we had an SOP that if we were above 100 KIAS at the 3 board, then we would go around. I'm currently instructing in the T-6B, and I teach my students to target "double the board," and to go around if they are faster than 60 KIAS at the 2 board.
Is this not emphasized in other segments of the aviation industry? Is an initial response to unresponsive brakes after touchdown usually to pull the emergency brakes instead of going around? It will be interesting to see what other forum members have to offer in this area. |
Originally Posted by Tummy
(Post 1772396)
In my fleet aircraft, the AV-8B, we had an SOP that if we were above 100 KIAS at the 3 board, then we would go around. I'm currently instructing in the T-6B, and I teach my students to target "double the board," and to go around if they are faster than 60 KIAS at the 2 board.
Is this not emphasized in other segments of the aviation industry? Is an initial response to unresponsive brakes after touchdown usually to pull the emergency brakes instead of going around? On my airplane a go around is not recommended after thrust reverser deployment. I'd guess most wouldn't recognize brake failure prior to reverser deployment. |
Originally Posted by mynameisjim
(Post 1772409)
On my airplane a go around is not recommended after thrust reverser deployment. I'd guess most wouldn't recognize brake failure prior to reverser deployment.
Pilot Techniques Of particular note: "Interestingly, thrust reversers are a mixed blessing. While obviously helping to slow down faster, they bring a pilot to a worse situation by giving him/her less time to decide if a go-around is appropriate." |
Originally Posted by USMCFLYR
(Post 1772403)
I'm not sure Tummy - but I wouldn't be surprised if the answer is that touch-n-gos (and probably most certainly roll-n-gos) are not procedures trained too, or practiced, in civilian turbine aircraft.
A go-around after TD due to poor stopping performance in a jet is almost universally a bad idea unless the airplane has specific procedures for it. Many things would doom that to likely failure...auto lift dumpers, spool up time, reverser stow time, lack of performance numbers for a rolling midfield TO. By the time you realize you need a GA, you're hosed. Better to go off the end at 20 kts than 120 kts.Typically reverse is used first down to a lower speed (80-100 kts) before heavy breaking is even applied...although you can always get on it immediately if you suspect impaired braking. |
For me, if the factored landing distance comes within 1,500' of the LDA, I'm on the brakes at touchdown with the TRs coming out. Waiting til 80 knots for the brakes us asking for an excursion. Brakes stop the plane, if in doubt, remember reversers aren't part of the landing distance computation. The reason? At full anti-skid braking, the plane is slowing too fast for the reversers to help. I've landed the C-5 on glare ice (RCR of 5) and the brakes stopped us exactly as the charts said.
GF |
Originally Posted by galaxy flyer
(Post 1772488)
For me, if the factored landing distance comes within 1,500' of the LDA, I'm on the brakes at touchdown with the TRs coming out. Waiting til 80 knots for the brakes us asking for an excursion. Brakes stop the plane, if in doubt, remember reversers aren't part of the landing distance computation. The reason? At full anti-skid braking, the plane is slowing too fast for the reversers to help. I've landed the C-5 on glare ice (RCR of 5) and the brakes stopped us exactly as the charts said.
GF |
A lot of people are bringing up thrust reversers in this conversation and I feel it's important to note that the Phenom 100 does not have thrust reversers. It also does not have spoilers of any kind. It has anti skid, and that's it.
I no longer have the performance books, but if it was raining and they actually had the 9 knot tail wind that was reported in the NTSB report, I'd be willing to bet that stopping distance would be almost all of the available runway. |
A lot of people are bringing up thrust reversers in this conversation and I feel it's important to note that the Phenom 100 does not have thrust reversers. It also does not have spoilers of any kind. It has anti skid, and that's it. I no longer have the performance books, but if it was raining and they actually had the 9 knot tail wind that was reported in the NTSB report, I'd be willing to bet that stopping distance would be almost all of the available runway. |
Originally Posted by mike734
(Post 1772500)
I wish the 737 had charts for glare ice.
|
Originally Posted by Tummy
(Post 1772396)
In my fleet aircraft, the AV-8B, we had an SOP that if we were above 100 KIAS at the 3 board, then we would go around. I'm currently instructing in the T-6B, and I teach my students to target "double the board," and to go around if they are faster than 60 KIAS at the 2 board.
Is this not emphasized in other segments of the aviation industry? Is an initial response to unresponsive brakes after touchdown usually to pull the emergency brakes instead of going around? The AV8B has a very different thrust to weight ratio from a transport aircraft. At 100 knots you are covering 166 feet per second. It can take 10 to 12 seconds to get meaningful trust from a large turbo fan with the reversers deployed. Transport category aircraft also operate with far larger variances in landing weight than is typical in tactical aircraft. To figure out a go around distance would require first knowing the time to spool to takeoff thrust which is altitude and temp dependent. Now you have to factor in landing weight, flap selection,TAS, winds and obstacle clearance. In addition many transport aircraft will not rotate well at landing trim settings and if a flap retraction is attempted to TO flaps won't rotate at all. Delta used to require touch and goes in training. It was a carefully coordinated event with flaps being retracted to TO and trim being reset on the roll. Still even on a touch and go a large amount of runway is used. Best to stick with the rule that once the reversers are deployed you're committed! |
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