How often should a Field Armoury get a full inspection?

Answer: Quarterly at 90 days, annually at 12 months; the weekly round is visual, nothing dismantled.

The gasket looks uncracked, so why replace it?

Answer: By compression set. Below 80 percent recovery after 24 h at 30 percent compression, it no longer seals.

Is 1 mm of pin clearance still usable?

Answer: Watch it, and fit bushes at the next quarterly. Above 1.2 mm the door needs a nudge to close.

Humidity stays high, so is the desiccant short?

Answer: Check the gasket and vent filter first. Above 60 percent RH for 72 hours, the seal has usually failed.

Does a little rust mean scrapping the cabinet?

Answer: A spot under 25 mm² is ground and recoated. Scrapping starts below 80 percent of nominal thickness.

Field Armoury Maintenance: Inspection and Replacement Limits

Quick answer: Keep a Field Armoury serviceable by measuring five slow variables on weekly, quarterly and annual cycles: locks and access records, hinge pin clearance, gasket and desiccant state, rack distortion, body corrosion. Each one gets a gauge and a replacement limit.

How Often a Field Armoury Should Be Inspected
Locks, Hasp and Access Records
Hinges, Pin Clearance and Door Sag
Gaskets, Desiccant and Dry-Air Modules
Corrosion, Rack Distortion and Scrapping Limits
FAQ

1. How Often a Field Armoury Should Be Inspected

A cabinet fails in stages: gasket first, then half a millimetre of hinge drop, then a door lifted to reach the third lock point. A Field Armoury inspection sheet cuts that drift into intervals, each asking: is this item inside its limit?

Weekly is the user's, five minutes, exceptions only. Quarterly is the stores team's, with feeler gauge, rule and hygrometer, filed for 24 months. Annual is part level, ending in a keep-or-replace verdict.

Cycle	Main items	Gauges
Weekly	door swing, lock engagement, condensation	torch, eyes
Quarterly	pin clearance, bolt travel, humidity	feeler gauge, rule
Annual	torque, rust, deflection	torque wrench, ultrasonic gauge

2. Locks, Hasp and Access Records

Locks are the most handled part of a Field Armoury and lose accuracy first. Three-point closure pairs two bolts with a central lock; bolt travel is 18 mm, frame engagement 12 mm, or a pry bar wins while the lock still tests fine.

Field Armoury: dark grey case open, black foam in the lid, cut bays holding a scoped rifle and cartridges, four latches on the rim

An 11 mm hasp eye takes a 10 mm shackle with a millimetre of slack, so the lock still opens after corrosion.

Access records are maintenance: a key log kept 24 months, an electronic log exported every 30 days. After 300 openings at one point, 1.5 mm of lost bolt travel calls for adjustment.

Replacement limits: any failed lock point, key force above 30 N, a sluggish bolt return.

3. Hinges, Pin Clearance and Door Sag

Pin clearance decides alignment. A new Field Armoury runs 0.3 to 0.5 mm per side, enough for the door to seat under its own weight; past 1.2 mm it needs a nudge, and past 2 mm the bore is oval and the hinge pair goes.

Sag is read 1 m up the free edge, before and after lifting: above 3 mm it is hinge drop, not gasket. Screws are M8 at 22 N·m, and one that lost 15 percent is replaced rather than retightened, or the threaded seat pulls out of the frame.

4. Gaskets, Desiccant and Dry-Air Modules

Judge the gasket of a Field Armoury by compression set: a sample compressed 30 percent for 24 h that recovers below 80 percent is finished. Hardness follows, a 65 Shore A strip reading above 75 A with no spring left in it.

Field Armoury: brown case open on a bench, seal channel around the lid rim, dark cut foam, a scoped rifle and cleaning rod beside it

The dryer follows the humidity record. Above 60 percent RH for 72 hours, check the gasket first and the vent filter second. Silica gel regenerates at 120 °C for 2 h at 25 percent moisture, 8 cycles a batch.

Vent and dryer are separate duties: the filter changes every 6 months, every 3 in dust.

5. Corrosion, Rack Distortion and Scrapping Limits

Rust on a Field Armoury starts where coating breaks. A spot above 25 mm², or rust over 0.5 percent of the surface, is ground back and recoated; a pit past 0.3 mm needs a thickness reading. Below 80 percent of nominal, 2.0 mm down to 1.6 mm, a panel is no longer structure.

A shelf loaded for 72 h is read at mid-span: past span/200, 3 mm on a 600 mm shelf, it has yielded. Column straightness above 6 mm out of 1 m means the body is out of square.

Part	Method	Scrap limit
Panel	ultrasonic, 5 points per face	under 80 percent nominal
Shelf	loaded 72 h, mid-span	over span/200, 3 mm at 600 mm
Column	1 m rule on the face	above 6 mm
Floor anchor	torque recheck	M10 under 40 N·m, stripping

An M10 anchor goes in at 45 N·m, rechecked yearly; a 10 percent loss is retightened, a spinning anchor relocated.

Conclusion

Lock records show who opened what, pin clearance shows whether the door still lines up, gasket recovery shows whether dryness holds, rust and deflection show how much body is left. Put those readings on weekly, quarterly and annual sheets and a replacement stops being an argument, so one shift can hand Field Armoury maintenance to the next.

This article discusses only the container (case body) side of specifications and design intent, and does not cover any handling, loading or use of the contents.