Mean Time Between Failures
Calculated by Engineering July 31, 2014
GRIDlink ADR model VT-IPM2M-113 ADR
1,658,500 Hours GB @ 40˚C per MIL-HNDBK-217F2
414,625 hours GF @ 40˚C.
207,312 hours GM @ 40˚C.
| Environment | Symbol | Description |
|---|---|---|
| Ground, Benign | GB | Nonmobile, temperature and humidity controlled environments readily accessible to maintenance; includes laboratory instruments and test equipment, medical electronic equipment, business and scientific computer complexes, and missiles and support equipment in ground silos. |
| Ground, Fixed | GF | Moderately controlled environments such as installation in permanent racks with adequate cooling air and possible installation in unheated building; includes permanent installation of air traffic control radar and communications facilities. |
| Ground, Mobile | GM | Equipment installed on wheeled or tracked vehicles and equipment manually transported; includes tactical missile ground support equipment, mobile communication equipment, tactical fire direction systems, handheld communications equipment, laser designations and range finders. |