FCO Crap

Question 1

Identify this gunfire logic

Answer 1

MAN/ORIDE

Question 2

What are the inhibit checks for MANUAL?

Answer 2

No inhibit checks performed by MC

Bypasses MC, sends fire pulse directly to ECU

ECU still performs several inhibit checks

Question 3

Draw with values U: 25/30mm Firing envelopes

Question 4

Identify this gunfire logic

Answer 4

SEMI

Question 5

List 3 components of FC geometry, which has greatest effect, why?

Answer 5

TAS* (the most critical component)

Induces both AZ and EL errors

ALTITUDE

BANK ANGLE

Question 6

Describe gun lag angle and what it compensates for

Answer 6

Gun lag angle is computed primariliy to cancel a/c TAS

Question 7

List 7 Hardwire switches on U

Answer 7

–WOW: Weight-on-wheels

–Master arm

–Fire control

–NAV / FCO gunfire inhibit

–LWCP arm / safe

–Gun-control panel arming

–Pilot’s trigger

Question 8

List Nav/FC mode heirarchy

Answer 8

GPS avail

GPS-INS2

GPS-INS1

GPS-TAS

GPS-DR

GPS unavail

INS2

INS1

TAS-DR

Question 9

Identify this gunfire logic

Answer 9

Fixed

Question 10

List indications of ½ mil, 6 mil, 9 mil, which is MC and which is ECU

Answer 10

½mil: Pass =’S’ indication, Fail = No ‘S’, MC check

6 MR: Pass = steady CIP, Fail = flashing CIP, MC check

9 MR: Fail = WCA, ECU check

Only check active in ORIDE (per -1)

Actually not being performed, Only check in ORIDE is firing envelope

Question 11

Given 2 nav/fc modes, which one is more accurate and why?

Question 12

Describe the purpose and effects on Gunfire-movement of Firing envelope, Trainable Envelope, and TRN Box

Answer 12

Trainable envelope/Trainable Box

–Software limit, resident in both OFP and ECU

–GFCS limits based on Hard Stops and Gun Boot

–Limits gun movement when positioning by any method other than manually

Trainable box

–A user-defined firing envelope

–Software restriction only in the OFP

–Centered on the nominal lag and depression angles of the gun

–Automatically inhibits gunfire if a gun travels outside the specified limits (entered by FCO)
Firing envelope/Firing Box

–Software limit, resident in both OFP and ECU, or GFCS

–Inhibit gunfire (not movement) if gun exceeds acceptable firing positions

–For 25 mm: Created to prevent structural damage due to possibility of projectiles striking the props–

–For 40 mm and 105 mm: Created to prevent damage to left wing due to overpressure created when the projectiles leave the guns.

Question 13

Describe Siacci range and limitations and problems associated with this range, and limitations on how this effects us and one solution

Answer 13

Description

Developed for flat fire trajectories with angles of departure of less than 15°

Now used as estimation of free fall trajectory

Limitations

accuracy decreases at greater than 15° angle of departure

equates to the shortend stand off range of us

Solution

faster computing allows derivative processing

Question 14

Identify this gunfire logic

Answer 14

Trainable

Question 15

Be able to label the following diagram

Question 16

Name the modes of fire you safely fire in with ORIDE selected. What will the effects be on the FCS?

Answer 16

FIXED/SEMI/MANUAL (not trainable)

Allows pilot to fire guns without completely stopping FCS MC processing

FC inhibit checks are bypassed

All FCS states are frozen

PA and CIP will still give accurate aiming cues in FIXED and SEMI

Question 17

what are the recommendations to improve accuracy

Answer 17

Video tape tweaks

Improve sensor shot calls, derotation and target track

Call point of impact instead of center of plume