Scusate, ma penso che si stia andando fuori tema.
La domanda era relativa all'impiego su B737, ebbene sull'AOM del 737 c'e' scritto Cap. 11.30.2 "The FMC satisfies the requirements of Basic Area Navigation (B-RNAV) when operated in accordance with thios Operations Manual. A single FMC is not certified to navigate accurately in conjunction with an accurate radio navaid enviroment. Airplane which are equipped with the Alternate Navigation System (ANS) are certified for operations outside radio navaid coverage, due to the independent position monitoring capability afforded by the ANCDU and the capability to navigate using the IRS positions if the FMC position should become Unreliable." Traetene le conseguenze.
Se ricordo bene le rotte per l'Egitto sono fuori dalla B-RNAV.
Meditate gente.