{"id":761,"date":"2026-06-18T10:19:17","date_gmt":"2026-06-18T04:49:17","guid":{"rendered":"https:\/\/neometrixgroup.com\/resources\/?p=761"},"modified":"2026-06-18T10:19:17","modified_gmt":"2026-06-18T04:49:17","slug":"landing-gear-testing-charging-test-rig-guide","status":"publish","type":"post","link":"https:\/\/neometrixgroup.com\/resources\/landing-gear-testing-charging-test-rig-guide\/","title":{"rendered":"Landing Gear Testing and Charging Rigs: The Complete Aircraft Maintenance Guide"},"content":{"rendered":"

Landing gear is the one aircraft system that absorbs the full kinetic energy of landing \u2014 every time the aircraft touches down. The oleo-pneumatic shock absorber at the heart of every landing gear strut uses compressed nitrogen over hydraulic fluid to absorb this energy. If the nitrogen pressure is wrong, or the fluid level incorrect, or if there are leaks \u2014 the shock absorber will either bottom out on landing (too little cushion) or sit compressed (over-serviced), both of which damage the aircraft structure and create safety hazards.<\/p>\n

A testing and charging test rig for landing gears is the dedicated ground support equipment used to verify shock absorber performance, service nitrogen pressure, top up hydraulic fluid, and check for leaks \u2014 on the aircraft or on a removed strut \u2014 per the Aircraft Maintenance Manual (AMM).<\/strong><\/p>\n

How Oleo-Pneumatic Landing Gear Shock Absorbers Work<\/h2>\n

The oleo-pneumatic strut uses two chambers separated by an orifice:<\/p>\n

Upper chamber (pneumatic):<\/strong> Contains compressed nitrogen gas at the charging pressure specified in the AMM. As the strut compresses on landing, this gas is compressed further \u2014 absorbing energy and providing the restoring force to extend the strut.<\/p>\n

Lower chamber (hydraulic):<\/strong> Contains hydraulic fluid (typically MIL-PRF-5606 or MIL-PRF-83282 aircraft hydraulic oil). As the strut compresses, fluid is forced through the orifice \u2014 providing damping.<\/p>\n

The combination of gas spring (nitrogen) and hydraulic damper absorbs landing energy and damps oscillation during taxi, takeoff, and landing.<\/p>\n

What a Landing Gear Test Rig Does<\/h2>\n

Nitrogen charging:<\/strong> Fills the upper pneumatic chamber to the specified charging pressure. The AMM specifies charging pressure as a function of strut extension (measured visually) \u2014 a critical two-parameter check requiring both pressure and extension measurement.<\/p>\n

Pressure verification:<\/strong> Verifies that charging pressure is stable (no leaks) over a defined hold period.<\/p>\n

Leak detection:<\/strong> Monitors pressure decay after charging to detect nitrogen leaks past seals or fittings.<\/p>\n

Hydraulic fluid servicing:<\/strong> Tops up hydraulic fluid in the lower chamber to the correct level. Fluid level must be checked and adjusted with the strut fully compressed.<\/p>\n

Bleeding:<\/strong> Removes air from the hydraulic fluid circuit \u2014 air causes spongy damping behaviour.<\/p>\n

Shock absorber performance testing (off-aircraft):<\/strong> On a removed strut, the test rig applies controlled compression loads and measures force vs displacement \u2014 verifying the strut meets its damping specification.<\/p>\n

International Standards and AMM Compliance<\/h2>\n\n\n\n\n\n\n\n\n\n\n
Reference<\/th>\nApplication<\/th>\n<\/tr>\n
AMM Chapter 32<\/td>\nAircraft Maintenance Manual \u2014 Landing Gear \u2014 OEM-specific<\/td>\n<\/tr>\n
MIL-PRF-5606<\/td>\nUS military hydraulic fluid (red)<\/td>\n<\/tr>\n
MIL-PRF-83282<\/td>\nUS military hydraulic fluid (clear, fire-resistant)<\/td>\n<\/tr>\n
AS1241<\/td>\nFire resistant hydraulic fluid<\/td>\n<\/tr>\n
DEF STAN 91-048<\/td>\nUK MoD hydraulic fluid specification<\/td>\n<\/tr>\n
EASA Part-145<\/td>\nApproved maintenance organisation requirements<\/td>\n<\/tr>\n
FAA AC 43.13-1B<\/td>\nAcceptable methods for aircraft maintenance<\/td>\n<\/tr>\n
NATO STANAG 1135<\/td>\nInterchangeability of hydraulic fluids<\/td>\n<\/tr>\n<\/table>\n

Why Skid-Mounted, Air-Powered Design Matters for Ramp Operations<\/h2>\n

Landing gear charging is performed on the aircraft \u2014 on the flight line or in the hangar. The test rig must be portable and must not require electrical power (which may not be available at remote ramp locations or forward military airfields).<\/p>\n

The Neometrix Landing Gear Test and Charging Rig is skid-mounted and air-powered \u2014 a nitrogen booster driven by compressed air (from aircraft ground support air supply or a portable compressor) boosts cylinder nitrogen to the charging pressure required. No electrical connection needed.<\/p>\n

Applications<\/h2>\n

Commercial airline MRO:<\/strong> Landing gear struts are serviced at every A-check, C-check, and D-check per the AMM. Large airlines service hundreds of struts annually.<\/p>\n

Military aviation MRO:<\/strong> Fighter aircraft, transport aircraft, and helicopter landing gear require servicing after every hard landing and at periodic maintenance intervals. Forward deployed military operations require portable, air-powered equipment.<\/p>\n

Aircraft manufacturers:<\/strong> New production landing gear struts are charged and tested before aircraft delivery.<\/p>\n

Landing gear overhaul facilities:<\/strong> Specialist landing gear MRO shops perform full overhaul and test on removed struts, requiring both off-aircraft performance testing and final charging.<\/p>\n

Neometrix Landing Gear Testing and Charging Test Rig<\/h2>\n

The Neometrix rig is a skid-mounted, air-powered system for main and nose landing gear shock absorber testing, nitrogen charging, leak testing, and hydraulic fluid bleeding \u2014 per AMM requirements for military and commercial aircraft.<\/p>\n

\u2192 View Full Specifications<\/a>
\n\u2192 Request a Quote<\/a><\/p>\n

FAQ<\/h2>\n

Q: What nitrogen pressure is used for aircraft landing gear charging?<\/strong>
\nA: Nitrogen charging pressure is aircraft-specific and specified in Chapter 32 of the Aircraft Maintenance Manual (AMM). Crucially, correct charging pressure depends on strut extension \u2014 the AMM provides a table or curve of pressure vs extension. The strut must be measured before charging, and pressure set accordingly. Typical nose gear charging pressures range from 100 to 200 bar; main gear from 150 to 350 bar depending on aircraft type and strut extension.<\/p>\n

Q: Why nitrogen and not air for landing gear strut charging?<\/strong>
\nA: Nitrogen is inert \u2014 it doesn’t react with hydraulic fluid, doesn’t support combustion (important given the hydraulic fluid present), and has a consistent moisture-free composition. Atmospheric air contains moisture and oxygen. Moisture causes corrosion of internal surfaces; oxygen creates a combustion risk in the presence of hydraulic fluid under high pressure. MIL-PRF-5606 and MIL-PRF-83282 specifications and most AMMs require dry nitrogen for strut charging.<\/p>\n

Q: What is a hard landing inspection and does it include landing gear testing?<\/strong>
\nA: A hard landing occurs when touchdown vertical acceleration exceeds limits specified in the AMM (typically 2.0\u20132.6g for commercial aircraft). After a reported hard landing, the AMM requires inspection of the airframe structure and landing gear. This includes checking shock absorber compression marks, inspecting for fluid leaks, verifying strut extension and charging pressure, and in some cases functional testing of the shock absorber. The Neometrix landing gear test rig supports this post-event inspection procedure.<\/p>\n

\n

Neometrix Defence Ltd. manufactures landing gear testing and charging rigs for military and commercial aircraft. contact@neometrixgroup.com | +91-7777-876-876<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

Landing gear is the one aircraft system that absorbs the full kinetic energy of landing \u2014 every time the aircraft touches down. The oleo-pneumatic shock absorber at the heart of every landing gear strut uses compressed nitrogen over hydraulic fluid to absorb this energy. If the nitrogen pressure is wrong, or the fluid level incorrect, […]<\/p>\n","protected":false},"author":2,"featured_media":762,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[69],"tags":[130,129,126,125,128,127],"class_list":["post-761","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-test-benches","tag-aircraft-landing-gear-maintenance","tag-amm-compliance","tag-landing-gear-charging","tag-landing-gear-test-rig","tag-nitrogen-charging-aircraft","tag-shock-absorber-testing"],"blocksy_meta":[],"yoast_head":"\nLanding Gear Test & Charging Rig: Aircraft Maintenance Guide | Neometrix<\/title>\n<meta name=\"description\" content=\"Complete guide to testing and charging rigs for aircraft main and nose landing gears. 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