Lemmon drop

Thank god you can put it all into words!
I would have got RSI just trying to type it.

By the way, not only is the A319 sick at BHX but the CAA have just paid them a visit!!!:)

Another interesting and important thread that has been turned into a debate about basic aircraft engineering knowledge.
I note the thread has been merged, with what? a 2nd year apprentice forum on screw threads.
I smell a rat and wonder if a BA TMG representative has sent this thread off topic.
Come on and back the Manchester guys and vent your spleen at the TMG engineers from BA who are bowing to their superiors and
trying to do something they have no recency on, they probably haven't satisfied BA Quality by providing a Personal Experience Record for their scrutiny. So has BA Quality just given them their
passified authorisation back under pressure from their superiors?
Get back to the original thread - tewksbury respond please - what is the latest info?

I'm sorry Time-ex if you smell a rat, as a time served mechanical fitter I was genuinely curious about non standard threads used in the aviation industry (at least non standard as far as my profession goes). It may well be basic aircraft engineering knowledge, but to someone of my background it is fairly interesting. I've spent many an unhappy hour either grinding tools or stood at a lathe machining threads of all descriptions most of which don't in the Zeus book. So fear not, a BA TMG rep is not on to you.

If this thread is so fragile that is not able to withstand the odd discussion going off on a tangent I sincerely apologise I will refrain from posting on this thread again.

Tinker - I wasn't pointing a finger at you. Please don't take offence. I can see from your other posts you are genuine.

I still want to know how former hands on engineers are given authorisation by their Quality department to do something they have never done before, when other engineers have to fill in reams of paperwork to get an authorisation on an aircraft they have been working on for 4 years plus? The answer won't be forthcoming if we talk about bolt and screwthreads.

BA in T4 got a visit from the CAA today - the nicest Sunday evening we've had for a while! They gave up their BBQ's to come and check out the engineering being carried out. Something must have stirred then into action?

It's a good job Dr.Sunday worked his miracle cure and all the sickies came back, it made us look as if we had enough blokes to do the work in hand.

2nd year apprentice forum ?. Screws (threads) are in fact BTEC O.N.C subject. Like Tinker if I don't know somthing I ask.

Rat ? I served my trade apprenticship at Hatfield 1964 to 1968.

Sounds more like "paranoia meets the muppets". Hows that for rude ???

More loose screws
 

Of course Hi-locks fit into the UN series that I mentioned before. e.g A first oversize for a 10 UNC hilock fastener would be 11 UNC that is 0.19'' + 0.013 and so just from the basis of knowing that the Unified series starts at 60 thau (0 UN) and progresses at 13 thau per progression. All bolts and oversize bolts can be calculated.

Now I would go on the explain a "Geometric progression" series like the BA range but I fear time-ex may not be able to keep up.

It is just a percentile increse in simple terms. But I digress from the topic.:cool: :rolleyes: :eek: ;)

oops a mistake
 

Of course with Hi-loks oversize the screw stays at a nominal size eg 10 UNF while the shank size increases 13 thau (1st oversize)

As we seem to have ambled all around all sorts of things. So what is happening now, is the bus still tits up in BHX or Man, or has it been moved on?

"BA have, 10 ex Cal CFM56 powered A320 G-BUSB Thru G-BUSK,"

I am still at a loss to understand what is wrong with these buses, Like many others around, these were my first experience when they were new and were regually only towed or taxyed, with infrequent airbourne excusions. But now they have matured, they must be a great potetial for extra hours of over time.