WRCS BITs

WRCS BIT

StepSystemAction
1.INSALIGN or NAV
2.Target alt/range knob170
3.ARBCS bombing timersSET
a. Pullup5.0
b. Release10.0
4.(P) BRG/DIST switchNAV COMP
5.(WSO) Nav mode switchNAV COMP

Laydown Mission

StepSystemAction
1.WRCS BIT selectorLAYDOWN
2.BIT buttonPUSH and HOLD
3.After 5 seconds, FRZ button.PUSH ON
a. Range indicatorON
b. After 15 secondsGO/NO GO

Dive Laydown Mission

StepSystemAction
1.WRCS BIT selectorDIVE LAYDOWN
2.BIT buttonPUSH and HOLD
3.After 5 seconds, FRZ button.PUSH ON
a. Alt indicatorON
b. After 15 secondsGO/NO GO

Dive Toss Mission

StepSystemAction
1.WRCS BIT selectorDIVE TOSS
2.BIT buttonPUSH and HOLD
3.After 5 seconds, FRZ button.PUSH ON
a. Alt indicatorON
b. After 15 secondsGO/NO GO

AGM-45 Mission

StepSystemAction
1.WRCS BIT selectorAGM-45
2.BIT buttonPUSH and HOLD
a. BDHI and HSI miles 7.6 ± 1.0 NM
b. Alt indicatorON
3.After 5 seconds, FRZ button.PUSH ON
a. BDHI and HSI miles DECREASE
b. AOA lower indexerPULL UP COMMAND
c. After 10 seconds, AOA center indexerLEVEL COMMAND
d. After 5 secondsGO/NO GO
e. After 5 seconds, AOA upper indexerDIVE COMMAND

Target Find/Offset Bomb Mission

StepSystemAction
1.WRCS BIT selectorTGT FIND/OFFSET BOMB
2.BIT buttonPUSH and HOLD
a. Alt indicatorON
3.After 5 seconds, along track cursor controlMOVE
4.Cross track controlMOVE
5.Cursor intensityADJUST
6.Reset buttonPUSH
a. Cursors return to zero range and azimuth.
7.Target insert buttonPUSH ON
a. Along track cursor6.5 NM on 00 grid line (±.2000 feet)
b. Cross track cursor30° +1.5° RIGHT
c. (P) HSI bearing pointer23° ±.2.5° (right of lubber); HSI TGT light - ON
d. TGT INS lightON
e. BDHI #1 needle23° ±.5° (right of top index)
f. (P-WSO) HSI and BDHI miles4.8±.1.0 NM
g. (P) Sight roll tabsROTATED CLOCKWISE
h. (P) ADI vertical pointerDEFLECTS FULL RIGHT
8.After 5 seconds, FRZ button.PUSH ON
a. (P-WSO) HSI and BDHI milesDECREASE TO ZERO, THEN INCREASE
b. (P) Sight roll tabsROTATES (as miles passes through zero)
c. After 15 secondsGO/NO GO

Bomb Range Calibration/Integration Check

StepSystemAction
1.INS modeNAV
2.WRCS control panelSET
a. Target distance N/SN120
b. Target distance E/W000
c. Target altitudeSET PRESENT AIRCRAFT HSL (29.92)
d. Release advance000
e. Release range000
3.Weapons delivery panelSET
a. Activate switchNORM
b. Target find switchHOLD
c. Range switchX100
4.Front cockpit switchesSET
a. Delivery modeT LAD
b. Weapon selectBOMBS
c. Station select buttonsOFF
d. Armament overridePUSH IN
5.TimersSET (values for delivery)
a. Pullup timer
b. Release timer
6.Target insert buttonPUSH ON
a. Along track cursorJumps to second BIT target
7.WRCS distance counters N/SIncrease or decrease until near edges of along track cursor and second BIT target coincide.
a. Note difference between counter and N120.
b. For larger counter value, correction is +; for smaller counter value the correction is -.
8.Target distance N/SRESET
a. Set preflight release range adjusted for calibration error in step 7.
b. Release range switchNORM or X100 (as required)
c. Activate switchON
9.Release range counterINCREASE (slowly until 1/3 second tone)
a. Check timer accuracy.
b. (P) Check LABS indications.
c. Note difference between derived RR counter reading and preflight release/activation range and apply as correction to all ranges.
(1) For larger counter value, correction is+; for smaller counter value, the correction is-.

WRCS turn off

StepSystemAction
1.WRCS BIT selectorRELEASE and OFF
2.Target alt/range counter000
3.Weapons delivery panel
a. Activate switchNORM
b. Target find switchNORM
c. Range switchNORM
4.WRCS control panelRESET