M102 105mm Gun Flashcards
Characteristics of the M102 105mm gun
Percussion-fired Single barrel cannon Hand-fed Recoil operated Air cooled
The M102 105mm gun provides fire against personnel, soft targets and light armor with _________ ________
pinpoint accuracy
The rate of fire of the M102 105mm gun is dependent on __________ ____________
crew efficiency
The maximum rate of fire for the M102 105mm is ______ rounds per minute for the first _______ minutes and then ________ rounds per minute thereafter
ten
three
three
CAUTION: Do not fire the 105mm gun when recoil exceeds _____ inches, to prevent excessive pressures in the recoil cylinder and excessive stress in the recoil mechanism
49
The two major components of the 105mm are:
Cannon Assembly
Recoil Mechanism
The cannon assembly of the 105mm consists of the following 3 parts
Blast Diffuser
Tube
Breech Mechanism
The _________ ____________ provides muzzle blast suppression, is internally threaded and attaches to the muzzle end of the tube and incorporates wedge-shaped bosses which act as secondary recoil stops in the event of a recoil mechanism failure.
blast diffuser
The AC-130U blast diffuser has a _______ ________ attached to cover the opening when the aircraft is pressurized
seal plate
The ________ houses round and directs projectile when fired. It is externally threaded at muzzle end to accommodate the internal threaded blast diffuser. The breech end is also threaded and screwed into the breech ring.
Tube
The ___________ ___________ holds the round of ammunition, detonates the propellant charge and partially extracts the empty case (or live round if not fired) It is housed in the breech ring
Breech Mechanism
The breech mechanism of a 105mm contains the ________ ________, a vertical sliding wedge
Breech Block
Internal components of the Breech Block include:
Trigger Percussion Mechanism Sear Retractor Cocking Lever
The ___________ ___________ contains the firing pin
Percussion Mechanism
The ________ pulls (cocks) the percussion mechanism rearward when the breech block is lowered
retractor
The __________ _________ is used to manually cock the firing mechanism with or without opening the breech
cocking lever
The ________ __________ __________ __________ is used to open and close the breech
breech block operating handle
The ________ _____________ __________ transmits the movement of the breech block operating handle, moving the breech block up and down
breech operating crank
__________ holds the breech block down and extracts and partially ejects empty cartridge case (or live round if not fired) from chamber
Extractors
The purpose of the ________ __________, a major component of the 105mm, is to stop the recoiling parts and return them to battery position without excessive shock
Recoil Mechanism
The recoil mechanism of the 105mm consists of the following 4 parts:
Cradle assembly
Sleigh assembly
Recuperator Cylinder
Recoil Cylinder
This part of the recoil mechanism supports the sleigh assembly and is fixed to the aircraft by the gun box and TGM.
Cradle assembly
The sleigh assembly ________ within the cradle assembly
slides
This part of the recoil mechanism includes 4 yokes which hold the recoiling parts together
Sleigh assembly
The ___________ ___________ houses and supports the recuperator cylinder at the top, cannon assembly in the center and the recoil cylinder at the bottom
sleigh assembly
The breech ring of the cannon assembly is threaded into the ________ yoke of the sleigh assembly
fourth