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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?

I believe they are different names for the same fastener. Visu-Lok being the more recent term used.

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...

SMP 583 specifies 35-45 inlb for 3/16 and 100-115 inlb for 1/4 in KFN542 nuts. Found in figure 51-70-12 sheet 2 of 5

TO 1C-130-A specifies 50-60 inlb for 3/16 and 100-115 inlb for 1/4 in KFN542 nuts. Found in figure 51-70-09 sheet 2 of 8

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...

Assume damage to pressurized skin, Flush patch required, skin - 2024-T3 .050, .063 doubler. SRM Calls for same size, type, spacing and distance between rows as nearest skin splice. MS20426AD5 Rivets 1.0 spacing, .8 pitch. Skin Splice is dimpled. .050 existing skin can't be countersunk due to...

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...

Good suggestion, unfortunatly we don't have access to an aircraft, simulators only.

The pump is only used to feed the cross feed manifold, all engines would be on tank to engine feed. 40 psi out of aux or external tanks. We do not teach, endorse or recommend this procedure. As you say, if it is not in the Operators Manual we do not teach it as a procedure or "technique"...

Nobody ever ventured a guess or tied to find the answer. They seemed content to say it could be done but not what could be expected!

Those are the pumps specs and what it is capable of under high demand. The pumps are fuel boost pumps that are submerged in fuel to keep them cool. They are designed to provide a higher volume of flow than maximum engine demand. We are trying to determine a volumetric flow thru a .375 in. open...

Thanks for the resonse! I made another mistake, the tube is .5 in but the fitting the fuel passes thru into the tank is .375 in. The pump is centrifugal pump with a rated output of 40 psi no flow and 27,400 gph at 12 psi. Assume the only demand on the pump is the .5 tube and fuel passing trhu...