Glideslope monitor for aircraft

A computer program product for alerting an aircraft flight crew of an inconsistency during an instrument landing system (ILS) approach to a selected runway, the computer program product comprising:

• first computer readable program means for receiving glideslope and localizer signals;
• second computer readable program means for determining aircraft approach angle to runway end;
• and
• third computer readable program means for alerting the aircraft flight crew of an approach inconsistency, if the determined aircraft approach angle to runway end is less than a threshold angular value and one or more parameters based on aircraft position and the received glideslope and localizer signals are met.

An apparatus for alerting an aircraft flight crew of an inconsistency during an instrument landing system (ILS) approach to a selected runway, the apparatus comprising:

• a component configured to receive glideslope and localizer signals;
• a component configured to determine aircraft approach angle to runway end;
• and
• a component configured to alert the aircraft flight crew of an approach inconsistency, if the determined aircraft approach angle to runway end is less than a threshold angular value and one or more parameters based on aircraft position and the received glideslope and localizer signals are met.