B757 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Confusion; Situational Awareness; Communication Breakdown
Aircraft Equipment Problem Critical
Flight Crew Overcame Equipment Problem
Manuals; Procedure; Human Factors; Aircraft
When crosschecking the [line selected] TXMEX RNAV STAR into Houston; I discovered that the 280 and 210 hard speeds at TXMEX and CRVZA; respectively; were not displayed. I contacted the Dispatcher to see if he knew why? He returned an ACARS message advising the flight planning software team said the program only does mach speeds; knots can't be entered.In any case the commercial producers of the database need to be informed so they can include the missing speeds in the next revision.
The actual problem was that the FMC was not displaying (and; therefore; autoflight would be unable to comply with) the mandatory speed restrictions at TXMEX and CRVZA. He also advised that he has flown both B757 and B767 aircraft on the STAR and both failed to program the restrictions.
A B757 Captain advised that the FMC database on both fleets failed to display the airspeed crossing restrictions at TXMEX and CRVZA published on the TXMEX RNAV STAR into IAH.