B737NG Trampling Speeds
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B737NG Trampling Speeds
Gentlemen,
I'm trying to chase up some info regarding the limitations (if any) placed on operating the B737NG on a co-user runway fitted with retractable arrestor gear.
Newcastle (Willytown) airport is a good example, lots of civil 737NG traffic at times when the arrestor wire is set, i.e. not retracted.
Info like maximum trampling speeds for both MLG and NLG would be nice, and most important, where is that info located?
Cheers...FD
I'm trying to chase up some info regarding the limitations (if any) placed on operating the B737NG on a co-user runway fitted with retractable arrestor gear.
Newcastle (Willytown) airport is a good example, lots of civil 737NG traffic at times when the arrestor wire is set, i.e. not retracted.
Info like maximum trampling speeds for both MLG and NLG would be nice, and most important, where is that info located?
Cheers...FD
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Our company operates the B737-800 to many airports throughout Europe that are Civil/Military and have arrestor wires. When down, there are no limits on trampling the wire either taking off or landing - makes a bit of a thud but no problem. Dropped arrestor nets are another story! Can't trample those.
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If is a BAK12/14 or equivalent that retracts into the runway, you don't have a problem (you're not touching it) provided that it is retracted.
If it is a permanently raised cable (held a couple of inches off the runway by rubber grommets) or a BAK12/14 in the raised position, you can only trample it if trampling trials have been done for the type of aircraft you are operating, and then only in accordance with those limits. Unless you are flying a military type it is unlikely that trampling trials will have been conducted. This will also apply to taxying over the cable.
If tension is lost in the cable (ie, cable has been drawn out of the braking drums) you cannot cross it at any speed in any type of aircraft.
The problem with tramping is that the cable can 're-bound' slightly off the runway after each set of landing gear has crossed it and could damage some part of the aircraft (esp brake lines, antennae).
If it is a permanently raised cable (held a couple of inches off the runway by rubber grommets) or a BAK12/14 in the raised position, you can only trample it if trampling trials have been done for the type of aircraft you are operating, and then only in accordance with those limits. Unless you are flying a military type it is unlikely that trampling trials will have been conducted. This will also apply to taxying over the cable.
If tension is lost in the cable (ie, cable has been drawn out of the braking drums) you cannot cross it at any speed in any type of aircraft.
The problem with tramping is that the cable can 're-bound' slightly off the runway after each set of landing gear has crossed it and could damage some part of the aircraft (esp brake lines, antennae).
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Yes BB,
You're quite right, I was referring to the BAK 12/14 system.
As I mentioned, I'm interested in the trampling speeds with the arrestor wire set, i.e. raised!
As there is 'never' a problem crossing with the wire retracted!
The 737NG is used by both the RAAF and the USN, that's why I feel there are specific speeds available.
any info - anywhere?
-8AS....I'm not referring to any barrier system, just the BAK 12/14 arrestor system.
You're quite right, I was referring to the BAK 12/14 system.
As I mentioned, I'm interested in the trampling speeds with the arrestor wire set, i.e. raised!
As there is 'never' a problem crossing with the wire retracted!
The 737NG is used by both the RAAF and the USN, that's why I feel there are specific speeds available.
any info - anywhere?
-8AS....I'm not referring to any barrier system, just the BAK 12/14 arrestor system.
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Someone out there in the RAAF Air Transport world may be able to check the US DoD pubs for a similar listing to that in ERSA Intro 13 as the yanks may list the clearances in a similar place. Not that RAAF ATC will let you trample unless ERSA lists your type as having an Australian approval, that would cause a liability issue.
Note that only some military types are cleared to trample cables. Some have not had trials done.
Note that only some military types are cleared to trample cables. Some have not had trials done.
