Wing tanks dropped before A-G munition's?

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saberrider

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Unread post13 Nov 2017, 20:26

It is possible to selecting wing tank before A-G ?
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MVSGas

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Unread post14 Nov 2017, 15:31

Could you elaborate? I do not understand your question.
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s_ellebaut

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Unread post14 Nov 2017, 18:15

You need to make a distinction between selective jettison and emergency jettison.

On the MFD SMS page in NAV mode you can select which stores you want to jettison under SelJet. In Sel Jet mode, with master arm on, hold the pickle for 1.5sec (IIRC) and only the selected stores will be dropped. So that way you could drop wing tanks only for example and keep A-G armament on the wings.

On the other hand, when you brake the semi-transparant plexi-like shield in front of the EmerJet button on the left aux panel, and push the button for a longer time (don't recall the actual time it needs to be depressed, should look it up in the -1), it will drop all your stores immediately, regardless of SMS SelJet settings or Master switch position.

Sidenote, IIRC, you can't drop A-A armament, and also (I)TERs/pylons remain on the wings during jettison.
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saberrider

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Unread post15 Nov 2017, 08:11

In this documentary ,about bombing nuclear reactor ,in Irak, on regime of SaddamHussein ,one pilot speak about long distance between target and home base is possible because they dropped wing tanks before A-G which is "no-no" because risking to hit pilon with munitions.
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s_ellebaut

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Unread post15 Nov 2017, 09:18

saberrider wrote:In this documentary ,about bombing nuclear reactor ,in Irak, on regime of SaddamHussein ,one pilot speak about long distance between target and home base is possible because they dropped wing tanks before A-G which is "no-no" because risking to hit pilon with munitions.

I don't know the details of the story, but the entire mission was a big gamble so dropping those bags could be a reality even considering the dangers.
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basher54321

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Unread post15 Nov 2017, 10:55

Don't know about the Block 5 / 10 on this mission but being a computer there was basic logic programmed into the SMS on the C that would alter tank release timing if there were stores on 3/7 on the Cs - so don't think there was any issue there.
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LinkF16SimDude

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Unread post15 Nov 2017, 20:27

If enemy air may be a factor, you can configure SelJett before launch or en route to punch the tanks off if you need the extra little bit of Gee to engage. It was always advertised that the Viper could engage an air threat while loaded for A2G (flick DGFT/MSL OVRD) and then return to the strike mission but I've never....ever....heard of it happening. Hornet, yes. Viper, no.
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basher54321

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Unread post15 Nov 2017, 21:04

Wondering where this is coming from - Iftach Spector describes this in his autobiog (Loud and Clear), and he writes that jettisoning the tanks with MK-84s on 3/7 hadn't been tested and they thought it could be an issue. (full ordnance testing not completed at that time by them)

Basically jettisoning the tanks on the way there he writes was mandatory to get to Baghdad and he states they found a set of flight conditions where they could safely jettison them. He states they jettisoned the tanks over the Iraqi border as they flew in.

looking at an older F-16A avionics manual for selective jettison of wing tanks describes that if there are any stores on 3/7 it just delayed jettison of one of the tanks by 150ms - I guess that could have been implemented post Opera.
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Meteor

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Unread post17 Nov 2017, 18:54

The below is from my F-16A (Block 15) -1 limitations section:

* The 300/370-gallon external tanks may be separated with any fuel loading, however, when 300/370-gallon external tanks are carried simultaneously, the 300-gallon tanks must be separated prior to 370-gallon tank separation. All wing mounted AIR-SURFACE stores must be separated prior to 370-gallon separation.

The below is from my F-16C (Block 40) -1 limitations section:

* If 300/370-gallon fuel tanks have been jettisoned, the JETTISON limit is 550 KIAS/0.9 mach for stations 3 and 7 and 450 KIAS/0.8 mach for stations 4 and 6 for fully loaded TER or with lower weapon (only) released. With all other TER loadings, the JETTISON limit is 300 KIAS/0.7 mach.

It would appear that sometime between Block 15 and Block 40 the prohibition on jettisoning the 370s with A/G ordnance onboard was rescinded.
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