Here's a report from individual pilot that is worth noting.

Here's a report from individual pilot that is worth noting. Situation: a newly come Trans-Atlantic flight in a fresh jet. Navigation equipment: two Global Positioning theory Sensor Units (GPSSU) as the primary means of navigation, along with three inertial navigation theorys (INS). INS #2 developed an error of an 12 miles. Soon after, the navigation solution from the one and the other GPSSU's was lost, for no apparent reason. moderately beautiful rapidly, the crew was asking the usual questions: (1) where are we, and (2) where are we headed? As mentioned, with 3 INS's they were not totally dissipated and navigation accuracy was still within required en-route limits. However, following investigation revealed that a single GPSSU failure can cause an incorrect computation of the GP position. Further, when alone one GPSSU is active, the failure may make progress undetected.

That's interesting. If the failure can proceed undetected, how's the crew suppos to know? Consider also the impact forward the enhanced ground proximity warning combination of parts to form a whole (EGPWS), which depends upon a GP navigation solution to determine aircraft location with heed to the terrain databases. It may be economical to devise procedures to terminate EGPW operation, accompanied by the agency of a suitable warning/indication, as betimes as the first GPSSU packs up (fails).

This is united of numerous instances of GP failure in novel months, we are informed. These incidents may fan the debate across the use of GPS as a sole-means of navigation (see ASW, March 22; March 1; Feb 22)

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