B707 320 Questions

[louross]

Is the necessary start pressure 30 or 40 psi?

I lost my paper, and don't remember my other question. I do enjoy flying this one, the 707-320 ADV, or is it the -320B?

Thanks louross

[aerofoto - HJG Admin]

3000 - 3200 PSI on the pneumatic air pressure gauge .... for all engine startups .... same as is the case for our CV880's, CV990's, and DC-8's too.

You have 2 choices as follows ....

1. Commence air delivery using the cart and then start #3 engine .... THEN .... once #3 is succesfully started shut down the air cart and run this engine up to whatever speed (select keyboard command "E+3") is necessary in order to generate 3000 - 3200 PSI of indicated pneumatic air pressure required for engine startup .... AND THEN .... using this bleed air system start engines #4, #2, and #1 .... THEN .... run engine #3 back down to idle .... AND FINALLY .... resynchronize all 4 engines (select keyboard commands "E+1+2+3+4") prior to departure.

2. Commence air delivery using the cart and then start #3 engine .... BUT THIS TIME .... do not shut off the air delivery system .... keep it running and the start engine #4, # 2, and # 1 acccordingly (no need to run #3 engine up to speed) .... THEN .... only once all 4 engines are started shutdown the air cart (no need to resynchronize all 4 engines prior to departure).

In both cases always start #3 engine first .... or nothing else can be started

Option 2 is/was the most commonly used system (it's a lot more economic fuel-wise) .... in so far as I observed these procedures being practiced during the 1970's and 80's.

These procedural options are featured within Engine Startup Tutorials published within our forum based online manuals for each of our simulations requiring this particular practice .... B707/720/C135, CV-880, CV-990, and DC-8 only.

Mark C

[louross]

okay, my Uncle Al remember him Al Zeimer?), has left, so the other question was that one boost pump, according to the manual, will supply the fuel. So, is it preferable to use one pump on an even day and the other on an odd day, or always run both pumps, or is it nothing more that the policy of that particular company?
Thanks again,
lou ross.

[aerofoto - HJG Admin]

If your question concerning the BP's is in regard to engine startups .... then .... my own forum based manual (of sorts .... nothing like some of our other more recntly compiled manuals/references) for the B707's/720's states as follows :-


- Select "ON" each of the 2 pairs of BOOST PUMP switches associated with engines # 1, # 2, # 3, and # 4 only .... those for the Center Tank can remain "OFF" until later during flight.


This manual also advises as follows in regard to the BP's ....


- When climbing above FL100 ensure the Boost Pumps (located on the F/E fuel management panel) are all set to "ON" and Fuel Valves for all the tanks being worked are set to "OPEN". Failure to do so will result in engine flameouts. This applies to all B707/720 panel versions.


Might pay to bear in mind the programming within our B707/720 panels probably represents some of the oldest we now offer. Whilst the geneology of our CV-880/990 and DC-8 panels may be older.... these particular panels have been updated more recently than any of those for our B707's/720's .... so .... the fidelity behind some of our recommended procedures won't be company specific or as finely tuned as that for some of our other panels, but, is still good, and very functional anyway .... in accordance with HJG tradition.

Pays also not to assume, or look for, complexity that may not be existent due to the developmental time line of some of our panels too (we offer panels compiled by ourselves as well as others imported from elsewhere .... both of which are based on different basic author compilation preferences .... some which dictates what we're able apply, and how, hence the procedure associated with some of our panels does differ accordingly) .... because we've learned a lot more and how to better, even more authentically, represent procedures/systems in regard to some of our much more recently released panels/simulations.

Even our B707/720 manual/service notes (it's the forum based one's written by me I'm referring to here .... not the downloadable PDF version compiled by George .... or the Fuel Tutorial PDF compiled by Harerton) is "basic" too .... not a bit as good as the manuals/service notes I've compiled for most of our other simulations .... simply because even I've learned a lot in regard to compilation and presentation since 2006 .... and the rest is just a lack of time with which to be able to recompile reference data. For what they're worth though these B707/720 notes "DO" contain a lot of valuable information, so, I recommend one familiarizes oneself with these anyway .... per the following link
tonymadgehjg.proboards.com/thread/1567/b707-panels-installation-handling-notes

Mark C
BOG/CO

[louross]

Thanks for that.
lou ross