Warning Systems Flashcards
What are considered GPWS “radio altitude-based alerts?”
- Excessive descent rate
- Excessive terrain closure rate
- Altitude loss after T/O or G/A
- Unsafe terrain clearance when not in landing configuration
- Excessive deviation below ILS GS
How does the (E)GPWS provide “look-ahead terrain alerts?”
An internal world-wide terrain database
What condition will inhibit a terrain alert?
An actual windshear warning
Can terrain and weather radar show together on a display?
No. If 1 pilot selects terrain and the other selects weather radar, each display updates on alternating sweeps
What conditions inhibit TCAS alerts?
GPWS and windshear warnings
What must an aircraft be equipped with to allow RAs?
Mode C transponder
Why should TCAS be placed in TA ONLY when performance is limited, such as with an inoperative engine?
To prevent receiving RAs beyond the aircraft’s capabilities
On T/O: GPWS windshear alerts are enabled below what altitude? When does detection begin?
1,500’ RA. GPWS windshear detection begins at rotation.
When does the wx radar automatically begin scanning for windshear on T/O? On approach?
(700/Max): Thrust levers set for T/O, even if engine is off or IRS not aligned. In flight below 2,300’ RA (700) / 1,800’ RA (Max)
(800): Thrust levers set for T/O. In flight <1,800’ RA
All: Predictive WS alerts issued below 1,200’ RA
When are predictive windshear CAUTIONS inhibited?
Between 80kts and 400’ RA
When are predictive windshear WARNINGS inhibited?
Between 100kts and 50’ RA
