GNS 530(A) Pilot’s Guide and Reference 190-00181-00 Rev. E13-8
SECTION 13
TAWS

Excessive Descent Rate Alert

The purpose of the Excessive Descent Rate (EDR) alert is to provide suitable notification when the aircraft is deter-

mined to be closing (descending) upon terrain at an excessive speed. Figure 13-8 shows the parameters for the alert as

defined by TSO-C151b.

6000
5500
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
02000 4000 6000 8000 10000 12000
"PULL UP""PULL UP"
"SINK RATE"
Descent Rate (FPM)
Height Above Terrain (Feet)
Figure 13-8 Excessive Descent Rate Alert Criteria