Connect AH-64 DAU cable (29304600) to the SPU AH-64A. For the AH-64D connect the AH-64 DAU cable to
the blade tracking test port located at the upper right hand section of the co-pilots SSU mount.
For AH-64D main rotor track and balance, ensure that the
FCR select switch on the Blade Tracking Test Port is in the
h. Route AH-64 to DAU cable under the copilot's seat and around to the DAU.
Connect AH-64 to DAU cable terminations to the DAU receptacles marked MULT-CH, TACHO 1, and 28 Vdc.
Place CADU in aircraft. Connect CADU to DAU cable (29325601) to CADU and to DAU receptacle marked
Figure 2. DAU installation at CPG station
PROCEDURE 3: EQUIPMENT INSTALLATION (SPU BYPASS)
This step provides instructions for bypassing the SPU.
This is done if the SPU is defective. If no SPU error is
suspected, proceed to procedure 4.
a. Locate the lateral permanently installed accelerometer above and to the rear of the pilots head and remove it.
Install accelerometer (28110900). See figure 3.
b. Connect accelerometer cable (29105605) (found in the basic kit) to the lateral accelerometer and connect to
the DAU receptacle marked ACC 1.
c. Install accelerometer (28110900) on accelerometer mounting bracket (29313000). Orient the accelerometer
vertically, with the connector facing down. For the AH-64A mount the bracket on the right-hand bulkhead
panel, near the gunner's right knee, third screw down, see figure 4. For the AH-64D remove the forward
avionics control head from the copilot/gunners right hand console and mount the vertical accelerometer near
the on board accelerometer, see figure 4.
d. Connect accelerometer cable (29105605) to the vertical accelerometer, and connect to the DAU receptacle
marked ACC 2.
Do not secure disconnected tachometer cable in next
procedure to any moving components, which may
interfere with flight controls.
Data Acquisition Unit