SIG SAUER SWISS ARMS SG552 - Manual (Page 21)

3.17. Procedure in case of malfunction
Whenever an SG 552 no longer works due
to a malfunction, proceed as follows.
• Carry out loading movement.
• Continue firing.
If the weapon does not fire:
• Insert a fresh magazine.
• Loading action.
• Continue firing.
If the weapon still does not fire:
• Put weapon on safe.
• Remove magazine.
• Loading action, hold bolt in rearmost position, check
ejection of cases and, if necessary, remove any jammed
cases or cartridges.
• Turn gas valve on position II when weapon is heavily
fouled or iced up.
• Insert fresh magazine and load.
• Set safety lever to desired firing mode, continue firing.
If the weapon still will not fire:
• Put weapon on safe.
• Unload per section 3.3.
• Clean weapon in accordance with section 4.1.
• Take up firing position.
• Load.
• Set safety lever to desired firing mode, continue firing.
If the weapon cannot be unloaded or the fault rectified by
the rifleman in accordance with the operating instructions,
a trained expert must be consulted. The following points
must be borne in mind:
• If the weapon cannot be unloaded immediately and
there is any danger of self-ignition due to a hot barrel
(140° C), wait at least 15 minutes.
• The weapon must remain in position as long as it is
loaded.
• Spectators and other unnecessary persons must be
sent away so that the problem can be tackled carefully
without disturbance.
• As long as the weapon is loaded, only trained experts
should be allowed to manipulate the weapon.
Malfunctions can largely be avoided by:
• Cleaning the weapon according to section 4.1. after
each period of firing, at the latest just after setting the
gas valve to position II.
• Carrying out cleaning in accordance with the regulations.
• Loading the magazine correctly.
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Handling
3.16. Function check
Each time the weapon is stripped, verify its functions
as follows:
Sequence of Procedure
1. Unload in accordance with section 3.3.
2. Remove magazine.
3. Inspect serial numbers.
4. Ensure that cocking handle has registered in correct
position.
5. Functions:
a) With safety lever on "S” execute loading cycle,
pull the trigger.
• Hammer must not drop, the trigger must be blocked.
b) With safety lever on "1”, pull the trigger and hold it back.
• Hammer must drop.
With the trigger held down, cycle the weapon once.
• Hammer must not drop.
Release the trigger and pull it again.
• Hammer must drop.
c) Execute loading cycle.
d) Safety lever on "3”, pult the trigger and hold it back.
• Hammer must drop.
With hammer held back, cycle the action
(allow bolt to slide forward slowly).
• Hammer must drop immediately as the bolt locks up.
Repeat the loading cycle.
• On the third loading cycle, the hammer must not
drop.
Release the trigger.
e) With safety lever on "20”, repeat procedure as under "3”.
• Hammer must drop each time.
f) Pressure point
Cycle the weapon:
• Safety lever on "1”, verify several time that pressure
point ist discernible.
6. Insert empty magazine, check that it is located firmly.
7. Bolt catch
a) Execute loading cycle.
• Bolt must be caught in its rear position.
b) Thumb up bolt catch.
• Bolt must immediately run forward.
c) Pull the trigger, apply the safety lever.
8. Check that the stowed butt is secured.
Handling
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