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Posts: 72
Joined: Sat Nov 17, 2001 11:56 am

INS: Ltn-72

Fri Nov 23, 2001 9:29 am

I was wondering, do any airlines still use the Litton-72 Inertial Nav. System? Most DC-10/ 747 classic/ Tristar operators around today seem to have upgraded to LTN-92'S, GPS-based systems or FMC's. The LTN-72 permits a maximum of 9 waypoint-entries which obviously limits the systems flight 'management' capabilities as it needs to be constantly updated throughout a long flight. Also, does any body have any information about how such a system is operated? For example are the waypoints 'replaced' with new ones as old ones are passed or are several added at say, waypoint 8? Sorry if that dosent make much sense, but I'm sure someone who knows their INS's will know what I mean!, Thanks in advance!
Posts: 1788
Joined: Mon Nov 12, 2001 10:34 am

RE: INS: Ltn-72

Fri Nov 23, 2001 3:13 pm

Usually additional waypoints are added at a convenient time, after number eight for example. Unless the LTN-72 has the radio update feature, it does not qualify for RNP-5 airspace requirements. It is however a very rugged piece of equipment with favorable MTBF.
Posts: 176
Joined: Wed Nov 29, 2000 3:05 am

RE: INS: Ltn-72

Mon Nov 26, 2001 11:38 pm

AdamHarvard: You might want to do a search on Litton Aero Products. Their website might direct you to someone that can give you some information on the LTN-72. Regards,

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