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Search: Posts Made By: barit1
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Forum: Jet Blast
29th Jun 2017, 12:38
Replies: 10
Views: 2,278
Posted By barit1

Remember the A-10 that went AWOL over Colorado,...

Remember the A-10 that went AWOL over Colorado, 20 years ago? That GAU-8 kept President Clinton's limo away back east for months!
16th Jun 2017, 17:34
Replies: 74
Views: 58,720
Posted By barit1

My edits: As others have pointed out,...

My edits:



As others have pointed out, the blades at high energy went orthogonal (or radially outward if you prefer). As such they would not intersect the #2 inlet; it must have been low-energy...
15th Jun 2017, 18:29
Replies: 74
Views: 58,720
Posted By barit1

Well, not quite. The original CF6 fan...

Well, not quite.

The original CF6 fan assembly was secured together by the spinner, which physically retained the blades in their dovetail slots.

In the above case (a colleague was an...
12th Jun 2017, 11:38
Replies: 74
Views: 58,720
Posted By barit1

Basic engineering knowledge. Without a LOT of...

Basic engineering knowledge. Without a LOT of airspeed, and certainly around Vr, there ain't much ram effect. We used to call it ram recovery speed; works well for you later in climb & cruise.
12th Jun 2017, 01:31
Replies: 74
Views: 58,720
Posted By barit1

Extermally, there is some resemblance tp 44 years...

Extermally, there is some resemblance tp 44 years ago: https://www.ntsb.gov/investigations/AccidentReports/Reports/AAR7502.pdf
Forum: Tech Log
31st May 2017, 18:04
Replies: 35
Views: 10,814
Posted By barit1

Pardon my dandruff while I scratch my head. ...

Pardon my dandruff while I scratch my head.

Seems to me the job of the cargo dispatcher is to plan the pallet etc. loading to optimize CG for the loaded aircraft. Given a random selection of heavy...
Forum: Tech Log
29th May 2017, 11:24
Replies: 35
Views: 10,814
Posted By barit1

Can there be any question? ...

Can there be any question?

https://s-media-cache-ak0.pinimg.com/originals/c5/a1/37/c5a13760db9e0000f462971c8b182a41.jpg
Forum: Tech Log
24th May 2017, 17:11
Replies: 11
Views: 2,923
Posted By barit1

galaxy flyer Not the first time. I recall...

galaxy flyer

Not the first time. I recall this being an issue on DC-8 re-engining with CFM56. Don't recall the solution specifics, but with over 100 aircraft eventually converted, it seems to...
Forum: Tech Log
23rd May 2017, 21:44
Replies: 11
Views: 2,923
Posted By barit1

The -80C2 gives plenty of takeoff thrust -...

The -80C2 gives plenty of takeoff thrust - perhaps even approaching a C-5 airframe structural limit. The bigger benefit I'm told is in ROC and the ability to climb directly to an efficient cruise...
Forum: Tech Log
21st May 2017, 19:28
Replies: 10
Views: 4,797
Posted By barit1

Slightly Off-topic - DC-9/MD80 glass

Seeing the ABX references above reminded me of a ca. 1992 visit to ILN and the ABX shop. They had acquired DC-9's from many operators and were stripping them for cargo container use. One was getting...
Forum: Tech Log
19th May 2017, 23:05
Replies: 14
Views: 4,577
Posted By barit1

I won't quarrel about takeoff fuel savings, but...

I won't quarrel about takeoff fuel savings, but that's not the only piece of the cost pie. If there's a fuel burn deterioration guarantee from the OEM, derate (or ATM) is taken into account in any...
16th May 2017, 00:32
Replies: 62
Views: 20,264
Posted By barit1

The guy rhat wrote the book

https://en.wikipedia.org/wiki/Max_Conrad
14th May 2017, 21:58
Replies: 44
Views: 26,338
Posted By barit1

The incompetent media missed the bit about them...

The incompetent media missed the bit about them narrowly missing a crowded schoolyard, hospital, and refinery (to say nothing of the neighborhood pub)
Forum: Tech Log
14th May 2017, 06:56
Replies: 7
Views: 4,755
Posted By barit1

Modular logistics

Given the modular design of the CFM56, LEAP, and virtually all modern engines, after the initial surge, there would seem to be little benefit in shipping whole engines back to manufacturers for the...
Forum: Tech Log
10th May 2017, 16:58
Replies: 52
Views: 24,497
Posted By barit1

Probably, although I used the VH-3 as a widely...

Probably, although I used the VH-3 as a widely visible example.
5th May 2017, 13:52
Replies: 73
Views: 59,441
Posted By barit1

background on KCRW

Eight years ago - remember the depressurized 733?

http://www.pprune.org/rumours-news/381184-southwest-737-lands-yeager-airport-after-hole-fuselage.html?highlight=Yeager+charleston
5th May 2017, 13:39
Replies: 73
Views: 59,441
Posted By barit1

UPS contract plane off runway - KCRW

Now reporting two killed. This is a hilltop runway at a joint civil-military field.

Cargo plane goes off runway at West Virginia airport - Cincinnati News, FOX19-WXIX TV...
Forum: Tech Log
28th Apr 2017, 17:36
Replies: 52
Views: 24,497
Posted By barit1

FWIW - The VH-3s of the presidential fleet (T58...

FWIW - The VH-3s of the presidential fleet (T58 engines) have rotor brakes to "park" the helo rotors, and at the same time the free turbines. They are generally started in this mode, and don't start...
Forum: Tech Log
28th Apr 2017, 12:27
Replies: 14
Views: 4,577
Posted By barit1

There have been 1 or 2 past PpRuNe threads...

There have been 1 or 2 past PpRuNe threads commenting that after a reduced ATM takeoff, selecting CLB may result in a throttle push. Yes, and TOC at rated CLB may well be harder on the engine than...
Forum: Tech Log
28th Apr 2017, 01:05
Replies: 14
Views: 4,577
Posted By barit1

It's a tradeoff, fuel vs engine maint cost. To me...

It's a tradeoff, fuel vs engine maint cost. To me (an old engine guy) it makes little sense to thrash those donks when it might save you a minute or two reaching TOC.

But a disciplined airline...
19th Apr 2017, 20:34
Replies: 271
Views: 163,816
Posted By barit1

It would cause an over-torque (or near so)...

It would cause an over-torque (or near so) condition, probably requiring a PGB teardown inspection.
15th Apr 2017, 22:33
Replies: 271
Views: 163,816
Posted By barit1

It was noticeable, and worsening, vibration which...

It was noticeable, and worsening, vibration which motivated the crew to shutdown #2. It was during this sequence the separation occurred.

Per Investigation: AO-2017-032 - In-flight propeller...
13th Apr 2017, 12:01
Replies: 271
Views: 163,816
Posted By barit1

Yes, anything that degrades the surface finish; a...

Yes, anything that degrades the surface finish; a scratch, improper part marking, . . .
12th Apr 2017, 14:13
Replies: 1,174
Views: 403,489
Posted By barit1

United's website boasts they carried 146 million...

United's website boasts they carried 146 million passengers last year.

And yet their CEO's immediate response to his customers could not be more tone deaf! :ugh: Need I go on?
11th Apr 2017, 14:42
Replies: 1,174
Views: 403,489
Posted By barit1

There are plenty of charter operators in ORD and...

There are plenty of charter operators in ORD and environs. A chartered twin to transport deadheading crew to SDF would be a LOT cheaper than all the adverse publicity!
11th Apr 2017, 14:32
Replies: 1,174
Views: 403,489
Posted By barit1

Thoughts come to mind: 1) Boarding completed...

Thoughts come to mind:

1) Boarding completed

2) Crew rostering wakes up to the fact they are short-staffed at SDF.

3) Let's make fools of ourselves by trying to entice boarded pax off the...
Forum: Tech Log
9th Apr 2017, 21:39
Replies: 52
Views: 24,497
Posted By barit1

Yes, an important point on any free-turbine...

Yes, an important point on any free-turbine engine (PT6A, PW100 series, CT7/T700, T58 etc.) Turning the output shaft via the prop has no measurable effect of airflow through the core, because there's...
4th Apr 2017, 21:19
Replies: 271
Views: 163,816
Posted By barit1

With the right fixture, this might be true....

With the right fixture, this might be true. Supporting the core engine is the issue; in the aircraft, the gearbox supports the engine, not the other way 'round.
4th Apr 2017, 11:31
Replies: 271
Views: 163,816
Posted By barit1

Nice story and with a thread of history perhaps,...

Nice story and with a thread of history perhaps, except the overheat would be in the gears and bearings inside the PGB assembly, where moving parts and fixed parts are in contact, thus friction heat...
3rd Apr 2017, 13:57
Replies: 271
Views: 163,816
Posted By barit1

True in a way, but in fact the PGB is married to...

True in a way, but in fact the PGB is married to the core engine in the shop, and the full powerplant is then hung in the aircraft.

And strange as it might seem, the PGB supports the core engine...
1st Apr 2017, 20:10
Replies: 271
Views: 163,816
Posted By barit1

Merely applying fleetwide statistics: If the...

Merely applying fleetwide statistics: If the airline has 25% spare engines, then the average engine has 20% fewer hours than the average plane. And the average plane might operate 1500 hours per...
30th Mar 2017, 01:41
Replies: 53
Views: 29,180
Posted By barit1

ABC Evening News (USA) reported the speedy, safe...

ABC Evening News (USA) reported the speedy, safe evacuation was helped by pax following safety advice: They didn't try to retrieve hand luggage.

This I find a little suspect. :rolleyes:

Video:...
Forum: Tech Log
28th Mar 2017, 18:05
Replies: 56
Views: 12,271
Posted By barit1

It was Sir Isaac: F = M * a Or in the TO...

It was Sir Isaac: F = M * a

Or in the TO case: a = F / M

;)
27th Mar 2017, 17:37
Replies: 25
Views: 5,254
Posted By barit1

Not Stinson but related

The Howard DGA series has been my specialty. I know that three new DGA-15P were contracted by Free French and were completed about the time of Pearl Harbor (12/41). These seem to be serials 550,551,...
25th Mar 2017, 18:39
Replies: 0
Views: 2,724
Posted By barit1

Citation fatal accident Kennesaw GA.

NTSB: Pilot reported autopilot issues moments before crash | WSB-TV (http://www.wsbtv.com/news/local/cobb-county/ntsb-pilot-reported-autopilot-issues-moments-before-crash/506008329)

Ohio media...
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