Airbus MODERN NAVIGATION STL 945.0415/99 Issue 5 – June 2004
A318/319/320/321s, A330s and A340s without GPS PRIMARY
The navigation system of these aircraft consists of 2 FM, 3 IRS and radio navaid sensors. The FM uses radio sensors for position updates or the mixed IRS position, if radio position is lost. This navigation system is certified, in compliance with the AC 20- 130A, as indicated in the Flight Manual. This navigation system also complies with the JAATGL2 (ACJ20 X4, AMJ 20-X2) for European Basic RNAV and TGL 10 for Precision RNAV in terminal area.
For these aircraft, navigation performance is mainly determined by the radio navaid ground infrastructure. In the European airspace, the operators can assume that the navaid ground infrastructure will support the RNP for Basic or Precision RNAV.
Outside radio navaid coverage (when in IRS ONLY), the RNP-X Type of capability will be maintained during a certain lapse of time, based on the demonstrated IRS drift rate, starting at the last IRS ground alignment or FMS radio update.
This navigation system is considered to meet all RNP-10 requirements during 6.2 flight hours since the IRS is placed in navigation mode, or 5.7 flight hours when the FMS discontinues radio updating. If the FMS is updated enroute, the Operator must demonstrate the effect of update accuracy on the time limit or may use the half-hour time reduction for automatic VORDME updates indicated in FAA Order 8400.12A, §12,e.
Authorities in charge of a particular airspace may specify a different time limitation (refer to ICAO Doc 7030).
In reference to FAA Order 8400.12A, aircraft eligibility for RNP-10 is classified in Group 2, paragraph 12.b.(1);(aircraft with FMS and ND).