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attitude.
12. Gun Check.
c. WPN-FIRE switch Press as desired.
13. Feed chute Check.
3. CPG.
4-58. ENGINE RUNUP. a. GUN switch SAFE.
1. MASTER SWITCH STBY.
4-84
TM 1-1520-248-10
b. V e r i f y M F D d i s p l a y s S T B Y ( f o r b. V e r i f y M F D d i s p l a y s S T B Y ( f o r
approximately 3 seconds) then SAFED. approximately 3 seconds) then SAFED.
WARNING WARNING
If MFD display does not change from If MFD display does not change from
STBY to SAFED, GUN bolt should be STBY to SAFED, GUN bolt should be
considered to be in FWD position. GUN considered to be in FWD position. GUN
circuit breaker or gun fuze may be open. circuit breaker or gun fuze may be open.
If MASTER switch is placed in STBY with Reset GUN circuit breaker if required.
gun switch in SAFE position, MFD will Verify MFD displays SAFED. If MASTER
display SAFED regardless of bolt switch is placed in STBY with gun switch
position. Refer to MALFUNCTION .50 in SAFE position, MFD will display
CALIBER MACHINE GUN for possible gun SAFED regardless of bolt position.
cookoff.
c. MASTER switch STBY or OFF. Allow gun
c. MASTER switch Set as required. to cool.
4-60. (CDS2) ISP/ R MCPU FAILURE NOTE
BACKUP MODE OPERATION. Gun cooling time is dependent upon the
ambient temperature and relative wind
1. WEAPON SEL switch Select gun. available for cooling the barrel.
2. GUN switch ARMED.
d. MASTER switch ARMED.
3. MASTER switch ARMED.
e. GUN switch ARMED.
4. WPN-FIRE switch Press to second detent.
f. Continue with in-flight procedures As
desired.
4 - 6 1 . MALFUNCTION . 5 0 CALIBER
MACHINE GUN.
4-62. ROCKET WEAPON SYSTEM 2.75-
NOTE INCH.
The 2.75-inch weapon system (fig. 4-47) is a light anti-
Gun malfunctions fall into two categories: personnel assault weapon. It is capable of air-to-air or
those that can be cleared by recocking such air-to-ground delivery. It allows fuze selections and can
as the misfire, hangfire, and doublefeeds, fire rockets one at a time, in pairs, or ripple. Rockets
and those that require the gun to be safed may be segregated into zones or fired until the supply
such as cookoff. is exhausted when ALL is selected. The system is
comprised of one or two 7-shot rocket launcher(s) and
1. Misfire/Hangfire/Doublefeed. the necessary components, software, and switches to
operate the system. The rocket launcher(s) can be
a. MASTER switch STBY. jettisoned using the JETTISON switches located on the
ACP. The weapon is electrically controlled and
b. GUN switch RECOCK. powered by the 28 Vdc essential bus. Circuit protection
is provided by the RKT PWR and ARMT CONTR circuit
c. Continue with in-flight procedures As breakers located on the aft centerpost circuit breaker
desired. panel. The rocket launcher(s) are mounted on the
ejector rack. They may be installed on one or both
2. Cookoff. sides. Symmetrical loading is not required.
a. GUN switch SAFE. a. Weapon Controls. Weapon controls are shown
in figure 4-47. Control/indicator functions are shown in
figures 4-48 and 4-49.
4-85
TM 1-1520-248-10
b. Weapon Configuration. The 2.75-inch rocket 4-63. ROCKET PROCEDURES 2.75 INCH.
system can be configured for operation by pressing the
WEAPON SEL switch up selecting the WEAPONS
PAGE. The CPG can call up the WEAPONS PAGE by 4-64. EXTERIOR CHECK 2.75 INCH
positioning the WPN/ASE switch momentarily to the ROCKET.
WPN position on the CPG auxiliary panel. The
WEAPONS PAGE (fig. 4-50) allows rockets to be
configured using the line address keys associated with 4-65. INTERMEDIATE FUSELAGE.
the displayed legend and the MFK. The remainder of
the configuration is accomplished on the WEAPONS 1. Ejector rack Check; impulse cartridges
BIT/SET-UP PAGE (figures 4-51 and 4-52). While installed.
entering any of the data, pressing ENTER without
entering a new value will cause the system to default to O 2. Rockets As required.
the previously entered value. Figures 4-53 and 4-54
show zones, f i r i n g sequence, and f i r i n g mode 3. Launcher Check. Check lanyard attached.
selections.
4. Electrical connectors Check.
c. OPERATION. Paragraphs 4-63 through 4-70
contain the procedural steps necessary to operate the O 5. Fuze umbilical Connected.
system.
d. (CDS2) ISP FAILURE. ISP failure will cause the 4-66. ENGINE RUNUP.
system to default allowing the system to be operated in
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TECHNICAL MANUAL OPERATOR’S MANUAL FOR ARMY OH-58D HELICOPT(116)
