Hydraulic Fuses
AD 98-06-10 requires the functional checking of the hydraulic fuses every three years or 1200 hours, which ever comes first. It means ALL THREE fuses, not just the indicator fuse. We are finding the sign-off for the AD just referencing the indicator fuse. Also, if you read the brake bleeding instructions in the manual, you will find that the fuse is required to be checked EACH time a brake is replaced and bled.
Showing posts with label Fuse. Show all posts
Showing posts with label Fuse. Show all posts
Wednesday, September 2, 2009
Friday, June 30, 2006
ATA 32
Brake Fuse
A fuse is installed between the forward and rear brake line at the main gear. Why is the fuse in the system? If this fuse were installed backwards, what would be the effect on the normal braking system? On the emergency braking system? Answer: The fuse is in the system to prevent the loss of braking should a rear brake line fracture. If a forward line were to fail, the emergency brake system would still function through the brake shuttle valve. If the aft line were to fail, the fuse would stop the flow of fluid overboard and allow the forward brake housing to continue to work. If the fuse were to be installed backwards, the system would work normally unless you had a rear line failure. If the rear line broke, all braking fluid to that gear would be lost overboard.
A fuse is installed between the forward and rear brake line at the main gear. Why is the fuse in the system? If this fuse were installed backwards, what would be the effect on the normal braking system? On the emergency braking system? Answer: The fuse is in the system to prevent the loss of braking should a rear brake line fracture. If a forward line were to fail, the emergency brake system would still function through the brake shuttle valve. If the aft line were to fail, the fuse would stop the flow of fluid overboard and allow the forward brake housing to continue to work. If the fuse were to be installed backwards, the system would work normally unless you had a rear line failure. If the rear line broke, all braking fluid to that gear would be lost overboard.
Wednesday, June 25, 2003
ATA 29
Brake & Hydraulic Indicating Fuse Checks
Westwind 1124/1124A maintenance technicians and operators are reminded of the recurring requirement to perform a functional test of the hydraulic fuses in their aircraft. Airworthiness Directive (AD) 98-06-10,Amendment 39-10387, states that a repetitive functional test of the hydraulic fuses in the brake system and emergency hydraulic indicating system will be done every 1,200 hours or 3 years after the initial inspection,which ever comes first, in accordance with Westwind Service Bulletin 1124-29-132.
This test is to make sure the fuse will stop the flow of hydraulic fluid after a leak has been detected. Some operators feel the AD no longer applies, if they had the brake fuse checked during brake change or if a fuse had been replaced. This is not so. There is no terminating action for the AD at this time. Both brake fuses and the indicating fuse need to be addressed in signing off the AD. Check your records to be sure you are in compliancewith this requirement.
Westwind 1124/1124A maintenance technicians and operators are reminded of the recurring requirement to perform a functional test of the hydraulic fuses in their aircraft. Airworthiness Directive (AD) 98-06-10,Amendment 39-10387, states that a repetitive functional test of the hydraulic fuses in the brake system and emergency hydraulic indicating system will be done every 1,200 hours or 3 years after the initial inspection,which ever comes first, in accordance with Westwind Service Bulletin 1124-29-132.
This test is to make sure the fuse will stop the flow of hydraulic fluid after a leak has been detected. Some operators feel the AD no longer applies, if they had the brake fuse checked during brake change or if a fuse had been replaced. This is not so. There is no terminating action for the AD at this time. Both brake fuses and the indicating fuse need to be addressed in signing off the AD. Check your records to be sure you are in compliancewith this requirement.
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