(b)
Pressing the GPWS/G/S pushbutton switch on the main instrument panel for Mode 5 (glide slope) visual and aural alert. This inhibition is temporary and the mode is automatically reactivated for a new envelope penetration.
(c)
Pressing the G/S MODE pushbutton switch on the overhead panel for Mode 5 (glide slope) visual and aural alert (permanent inhibition).
(d)
Pressing the SYS pushbutton switch on the overhead panel for inhibition of GPWS Modes 1 to 5 (visual and aural alerts).
(e)
Pressing the TERR pushbutton switch on the overhead panel for inhibition of TAD and TCF functions (visual and aural alerts).
(f)
All aural messages are inhibited if a stall or a windshear (if WR/PWS is installed) is in progress.
1EFF : 001-049, 051-099, 101-105, 151-199, 1 34-48-00Page 77 1201-214, 1Config-1 Aug 01/05R 1 1 1CES 1
(4) Faults which prevent normal Enhanced GPWC operation are stored in the BITE memory. They can be read on the MCDU.
**ON A/C ALL
B. Detailed Operation - Modes 1 through 5 This section describes the five warning modes of the Enhanced GPWC and describes the operation of each of the modes.
R **ON A/C 106-149, 215-299, 301-399, 401-499,
(1) Mode 1 - Excessive rate of descent
(Ref. Fig. 010)
(a)
Mode 1 provides the pilot with an alert/warning for high descent rates into terrain. The pilot also receives a timely alert for rapidly building sink rates near the runway when landing. The figure shows the outer and inner boundaries whose penetration triggers the alert/warnings.
(b)
The outer boundary is a straight line which has an equation of:
H warn (ft.) = - 572 ft. - 0.6035 X Altitude rate.
NOTE : The descent rate is considered negative during the
____ descent. The formulas provide theoretical target values only.
(c)
The outer warning boundary is biased to the right as a function of glide slope deviation above (Fly Down) the beam in order to prevent unwanted warnings while re-positioning from above the beam.
(d)
The penetration of this outer boundary activates the PULL UP legends and produces the voice warning SINK RATE repeated twice, then it remains silent unless the excessive descent rate condition degrades by approximately 20 per cent.
(e)
Further penetration of the first boundary reaches the inner boundary where the voice warning changes from SINK RATE to PULL UP. This inner boundary is composed of two straight lines. The equation which describes the lower line is:
H warn (ft.) = - 1620 ft. - 1.1133 X Altitude rate.
1EFF : ALL 1 34-48-00Page 78 1 1 Config-1 Aug 01/05 1 1 1CES 1
Enhanced GPWS - Excessive Rate of Descent
Figure 010
R 1EFF : ALL 1 34-48-00Page 79 1 1 Config-1 May 01/04 1 1 1CES 1
The equation which describes the upper line is:
H warn (ft.) = - 400 ft. - 0.400 X Altitude rate.
(f)
Both boundaries are cut off at the top by a radio altitude of 2450 ft. The lower is cut off at 10 ft. A delay equivalent to 0.8 seconds is included in the upper function to minimize the warnings caused by the momentary boundary penetration.
(g)
Both boundaries can be biased to the right at certain airports through envelope modulation to minimize nuisance warnings.
**ON A/C 001-049, 051-099, 101-105, 151-199, 201-214,
(1) Mode 1 - Excessive rate of descent
(Ref. Fig. 010)
(a)
Mode 1 provides the pilot with an alert/warning for high descent rates into terrain. The pilot also receives a timely alert for rapidly building sink rates near the runway when landing. The figure shows the outer and inner boundaries whose penetration triggers the alert/warnings.
(b)
The outer boundary is a straight line which has an equation of:
H warn (ft.) = - 572 ft. - 0.6035 X Altitude rate.
NOTE : The descent rate is considered negative during the
____ descent. The formulas provide theoretical target values only.
(c)
The outer warning boundary is biased to the right as a function of glide slope deviation above (Fly Down) the beam in order to prevent unwanted warnings while re-positioning from above the beam.
(d)
The penetration of this outer boundary activates the GPWS legends and produces the voice warning SINK RATE repeated twice, then remains silent unless the excessive descent rate condition degrades by approximately 20 per cent.
(e)
Further penetration of the first boundary reaches the inner boundary where the voice warning changes from SINK RATE to PULL UP. This inner boundary is composed of two straight lines. The equation which describes the lower line is:
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