|Quoting HAWK21M (Reply 39):|
Quoting KELPkid (Reply 38):
How does the design of the 737's main gear wheel wells play into this decision
On the -NGs the "frangible fitting" will avoid that gear to retract.If its a tire burst,to protect the wheel well components.
To elaborate, it is a thumbsize piece of pipe sticking outfrom the outer edge of each main wheel well, which is close at one end and with the other end fixed to a T-fitting in the landing gear up line. The pipe has a notch about an inch from it's tip.
Should a tyre burst, the remains would be flapping around at high speed and with the landing gear retracting, would smash everything inside the wheel well.
Now the landing gear retracts, the debris will hit this "frangible fitting", which woul break off at the notch and thus bleed the hydraulic pressure from the LDG up line, preventing the gear from retracting. At the same time a hydraulic fuse would close in the up line upstream of the fitting to prevent further loss of hydraulic fluid.
The 737 Jurassic had massive protective screens mounted in the main wheel well.