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5. Armament control panel (ACP) (CDS4) Normal VSD weapons pages are no longer
available for display.
6. Two universal weapon pylons (UWP).
7. .50 caliber machine gun weapon system. 4-48. PILOT DISPLAY UNIT.
8. 2.75-inch rocket system.
WARNING
9. Air-To-Air Stinger (ATAS) missile system.
10. HELLFIRE missile system. Use of NVG goggles is prohibited when
the PDU is installed.
4-45. PILOT CYCLIC GRIP SWITCHES.
a. The Pilot Display Unit (PDU) (fig. 4-37) is
Pilot cyclic grip switches (fig. 4-34) allow the pilot to mounted to the helicopter airframe above
access the CDS and input weapons system commands. the pilots windshield. The PDU can be
adjusted vertically for differing pilot eye
levels. The PDU control panel has a BRT
4-46. CPG AUXILIARY CONTROL PANEL. knob which allows pilot to adjust display
brightness and a TEST button which
The CPG auxiliary control panel (fig. 4-35 and fig. 4-36) initiates the built-in test (BIT) of the PDU
allows the CPG to access WEAPON and ASE pages. and Electronics Unit (EU). The PDU
provides symbology (fig. 4-38) and weapon
4-47. MFD WEAPONS DISPLAYS. system status for ATAS and symbology only
for 2.75-inch rocket and .50 caliber machine
gun weapon systems.
WARNING
b. During BIT, the word TEST (fig. 4-39) will be
• To ensure the aircraft is not allowed to displayed on the PDU while BIT is in
drift into nearby obstacles, the pilot progress. The BIT will take approximately 5
shall divide his attention between MFD seconds. A successful BIT will be indicated
symbology and o u t s i d e a i r c r a f t by the word PASS being displayed on the
clearance. PDU. An unsuccessful BIT will be indicated
by the word FAIL being displayed along with
• When performing MFD weapons a list of the failed components. The weapon
engagements, both crewmembers may symbology should follow in 5 seconds even
inadvertently focus their attention if the BIT is unsuccessful.
4-68
TM 1-1520-248-10
CONTROL/INDICATOR FUNCTION
1. WEAPON SEL switch If the same weapons system is installed on both sides of the helicopter, the
WEAPON SEL switch may be moved to either side to select the system.
Left position selected Selects left weapon system and calls up normal weapon VSD page for
weapon currently mounted on the left side of the aircraft. A second selection
of the left position will cause the VSD to change to sparse. Subsequent
selections will toggle between normal and sparse displays. After first
selection, the weapon will be armed by the AEU if the MASTER switch is in
the ARMED position.
Right position selected Selects right weapon system and calls up normal weapon VSD page for
weapon currently mounted on the right side of the aircraft. A second
selection of the right position will cause the VSD to change to sparse.
Subsequent selections will toggle between normal and sparse displays. After
first selection, the weapon will be armed by the AEU if the MASTER switch
is in the ARMED position.
Figure 4-34. Pilot Cyclic Grip Controls/Indicators (Sheet 1 of 2)
4-69
TM 1-1520-248-10
(Cont)
CONTROL/INDICATOR FUNCTION
Forward position selected Calls up WEAPONS PAGE.
Aft position selected Calls up ASE PAGE.
2. ODA switch Steps through ODA brightness levels starting with preset level selected on
INITIAL PAGE 2 to full brightness to OFF.
3. MSL STEP switch
NOTE
Once an ATAS missile has been sequenced by pressing the MSL STEP switch; the
ATAS system does not recognize that the missile is present for firing. To regain that
missile, cycle the MASTER switch to OFF and back to ARMED.
ATAS Overrides automatic missile selection allowing next missile to be selected.
HELLFIRE Overrides automatic missile selection allowing manual selection if manual
HELLFIRE launch mode is selected on VSD.
4. MSL ACTVT switch
ATAS
First time pressed Spins up missile gyro and begins cooling seeker head. MFD and PDU
displays change to show missile activation.
Second time pressed Deselects missile.
5. WPN-FIRE switch
GUN
1st detent Fires up to 1.0 second burst each time pressed and held.
2nd detent Fires continuously until released.
ATAS
1st detent Select uncage position.
2nd detent Starts firing sequence and fires missile. Missile symbol will go away and
next missile will spin up.
HELLFIRE
1st detent No function in HELLFIRE Mode.
2nd detent Launches missile and missile present symbology will disappear from fired
missile.
2.75 ROCKETS
1st detent No function.
2nd detent Fires rocket(s)
Figure 4-34. Pilot Cyclic Grip Controls/Indicators (Sheet 2 of 2)
4-70
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TECHNICAL MANUAL OPERATOR’S MANUAL FOR ARMY OH-58D HELICOPT(112)
