NAVAIR 01-1A-8 states they can be reused if threads are not damaged. Several SRM's also state they can be reused. Condition and common sense needs to prevail. But the technical answer is yes they can. Some SRM's might also prohibit reuse. Yes, unless specifically prohibited?
Will. I agree with you in all regards. Thanks to you all I can give them engineering feed back. I said I was in Japan but it's not them. I am relaying this info from my colleague who is covering my classes back in Tampa. I am not at DNA. I wotk for CAE USA in Tampa. We train C-130 aircrew and...
I agree with both of you guys. Their stated purpose of the heating is "they drive easier" which is crazy. Over driving was always the problem I encountered.
I do not want to disparage a particular customer re:Country Air Force, but they are notorious for over thinking the C-130 and thinking...
Recently heard one of our customers heat treat AD rivets to about 200 F for one hour prior to installation so they drive easier. As a structural repair tech and current instructor I have never heard of this practice. My concern is they are annealing the rivets and they will never handle the...
Will, the C-130 SRM allows a MS or KFN542 nut as a substitute for HL70 and HL86 nuts. The SRM does not specify a torque for the nuts so we use the break off torque for the specified collar. Just our assumption of best practice.
An additional comment on the use of a MS nut for those that use...
Will, I am fairly certain the C-130 engine truss mounts have been modified to 7075-T73. This was due to both corrosion and cracking problems in the mid-late 80's. I can provide a contact name at the US Coast Guard repair center who could offer additional information. Send me a pm and I will make...
Thank you very much folks. What you all have described as the problems with dimpling has confirmed my thoughts on the SRM and best practices for fatigue resistant repairs.
The suggestions and comments are greatly appreciated.
Rob
rb1957, cut out is approx 2"x2". The repair is on a C-130. I teach a class in structural repair. We use pieces of c-130 structure to perform the repair. I had 2 technicians perform the repair with 1/2 dimpled and the other half using NAS1097. The tools used are available to most org level techs...
NAVAIR 01-1A-8 specifies:
5/32 4 inlb, 2 inlb if installed wet with sealant
3/16 6 inlb
1/4 10 inlb
5/16 20 inlb
3/8 30 inlb
Make sure torque is applied counterclock wise, if not the fastener will loosen even more.
The manuafaturer also has specifications, they match all engineering specs I...
I forgot to add the TO 1-1A-8 is incorrect when it shows UNF threads for all aircraft bolts. The specification for the bolts will state rolled threads. Try this. Take one of the old bolts and run a die down the threads. When you are done you will have metal filings result. That is because the...
I would also caution against adding threads. The specs for your bolt most likely are UNJF threads, which means they are rolled threads, not cut. If you use a die (UNF) to add threads you will not only reduce the tensile strength of the bolt but also remove the cadmium plating from the shank...
