WRCS BITs
WRCS BIT
| Step | System | Action | 
|---|---|---|
| 1. | INS | ALIGN or NAV | 
| 2. | Target alt/range knob | 170 | 
| 3. | ARBCS bombing timers | SET | 
| a. Pullup | 5.0 | |
| b. Release | 10.0 | |
| 4. | (P) BRG/DIST switch | NAV COMP | 
| 5. | (WSO) Nav mode switch | NAV COMP | 
Laydown Mission
| Step | System | Action | 
|---|---|---|
| 1. | WRCS BIT selector | LAYDOWN | 
| 2. | BIT button | PUSH and HOLD | 
| 3. | After 5 seconds, FRZ button. | PUSH ON | 
| a. Range indicator | ON | |
| b. After 15 seconds | GO/NO GO | 
Dive Laydown Mission
| Step | System | Action | 
|---|---|---|
| 1. | WRCS BIT selector | DIVE LAYDOWN | 
| 2. | BIT button | PUSH and HOLD | 
| 3. | After 5 seconds, FRZ button. | PUSH ON | 
| a. Alt indicator | ON | |
| b. After 15 seconds | GO/NO GO | 
Dive Toss Mission
| Step | System | Action | 
|---|---|---|
| 1. | WRCS BIT selector | DIVE TOSS | 
| 2. | BIT button | PUSH and HOLD | 
| 3. | After 5 seconds, FRZ button. | PUSH ON | 
| a. Alt indicator | ON | |
| b. After 15 seconds | GO/NO GO | 
AGM-45 Mission
| Step | System | Action | 
|---|---|---|
| 1. | WRCS BIT selector | AGM-45 | 
| 2. | BIT button | PUSH and HOLD | 
| a. BDHI and HSI miles 7.6 ± 1.0 NM | ||
| b. Alt indicator | ON | |
| 3. | After 5 seconds, FRZ button. | PUSH ON | 
| a. BDHI and HSI miles DECREASE | ||
| b. AOA lower indexer | PULL UP COMMAND | |
| c. After 10 seconds, AOA center indexer | LEVEL COMMAND | |
| d. After 5 seconds | GO/NO GO | |
| e. After 5 seconds, AOA upper indexer | DIVE COMMAND | 
Target Find/Offset Bomb Mission
| Step | System | Action | 
|---|---|---|
| 1. | WRCS BIT selector | TGT FIND/OFFSET BOMB | 
| 2. | BIT button | PUSH and HOLD | 
| a. Alt indicator | ON | |
| 3. | After 5 seconds, along track cursor control | MOVE | 
| 4. | Cross track control | MOVE | 
| 5. | Cursor intensity | ADJUST | 
| 6. | Reset button | PUSH | 
| a. Cursors return to zero range and azimuth. | ||
| 7. | Target insert button | PUSH ON | 
| a. Along track cursor | 6.5 NM on 00 grid line (±.2000 feet) | |
| b. Cross track cursor | 30° +1.5° RIGHT | |
| c. (P) HSI bearing pointer | 23° ±.2.5° (right of lubber); HSI TGT light - ON | |
| d. TGT INS light | ON | |
| e. BDHI #1 needle | 23° ±.5° (right of top index) | |
| f. (P-WSO) HSI and BDHI miles | 4.8±.1.0 NM | |
| g. (P) Sight roll tabs | ROTATED CLOCKWISE | |
| h. (P) ADI vertical pointer | DEFLECTS FULL RIGHT | |
| 8. | After 5 seconds, FRZ button. | PUSH ON | 
| a. (P-WSO) HSI and BDHI miles | DECREASE TO ZERO, THEN INCREASE | |
| b. (P) Sight roll tabs | ROTATES (as miles passes through zero) | |
| c. After 15 seconds | GO/NO GO | 
Bomb Range Calibration/Integration Check
| Step | System | Action | 
|---|---|---|
| 1. | INS mode | NAV | 
| 2. | WRCS control panel | SET | 
| a. Target distance N/S | N120 | |
| b. Target distance E/W | 000 | |
| c. Target altitude | SET PRESENT AIRCRAFT HSL (29.92) | |
| d. Release advance | 000 | |
| e. Release range | 000 | |
| 3. | Weapons delivery panel | SET | 
| a. Activate switch | NORM | |
| b. Target find switch | HOLD | |
| c. Range switch | X100 | |
| 4. | Front cockpit switches | SET | 
| a. Delivery mode | T LAD | |
| b. Weapon select | BOMBS | |
| c. Station select buttons | OFF | |
| d. Armament override | PUSH IN | |
| 5. | Timers | SET (values for delivery) | 
| a. Pullup timer | ||
| b. Release timer | ||
| 6. | Target insert button | PUSH ON | 
| a. Along track cursor | Jumps to second BIT target | |
| 7. | WRCS distance counters N/S | Increase 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/S | RESET | 
| a. Set preflight release range adjusted for calibration error in step 7. | ||
| b. Release range switch | NORM or X100 (as required) | |
| c. Activate switch | ON | |
| 9. | Release range counter | INCREASE (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
| Step | System | Action | 
|---|---|---|
| 1. | WRCS BIT selector | RELEASE and OFF | 
| 2. | Target alt/range counter | 000 | 
| 3. | Weapons delivery panel | |
| a. Activate switch | NORM | |
| b. Target find switch | NORM | |
| c. Range switch | NORM | |
| 4. | WRCS control panel | RESET |