Q26 — ECAC Auto Start / Manual Start
078 IAS-A4.01 (3.1)
Given:
• The PO observes the following:
Note: Image difficult to read. Key information: ECAC is in AUTO. Lowest Control Air HDR Press is 86 psig. A Button is "MANUAL" and B Button is "START".
Which ONE of the following completes the statements below?
The 2 Emergency Air Compressor _(1)_ reached its AUTOMATIC start setpoint.
If the PO is required to MANUALLY start the 2 Emergency Air Compressor, depressing BEZEL button(s) _(2)_ is/are the MINIMUM pushbutton manipulation(s) required to start the emergency air compressor.
• The PO observes the following:
Note: Image difficult to read. Key information: ECAC is in AUTO. Lowest Control Air HDR Press is 86 psig. A Button is "MANUAL" and B Button is "START".
Which ONE of the following completes the statements below?
The 2 Emergency Air Compressor _(1)_ reached its AUTOMATIC start setpoint.
If the PO is required to MANUALLY start the 2 Emergency Air Compressor, depressing BEZEL button(s) _(2)_ is/are the MINIMUM pushbutton manipulation(s) required to start the emergency air compressor.
A. _(1)_ has _(2)_ A then B
B. _(1)_ has _(2)_ B ONLY
C. _(1)_ has NOT _(2)_ A then B
D. _(1)_ has NOT _(2)_ B ONLY
▶ Show Answer & Explanation
✓ C. Correct. For Part 1, the 2 ECAC will automatically start when control air pressure is less than 85 psig. Consequently, since the lowest control air pressure is 86 psig, the 2 Emergency Air Compressor has NOT reached its AUTOMATIC start setpoint. For Part 2, depressing BEZEL button(s) A then B are the MINIMUM pushbutton manipulation(s) required to start the emergency air compressor.
✗ A. Incorrect but plausible. For Part 1, S2.OP-AB.CA-0001 (Loss of Control Air) requires the crew to manually start ECAC when control air pressure reaches 88 psig. Consequently, the candidate could incorrectly deduce that the automatic start setpoint for the ECAC is 88 psig. Part 2 is correct.
✗ B. Incorrect but plausible. For Part 1, S2.OP-AB.CA-0001 (Loss of Control Air) requires the crew to manually start ECAC when control air pressure reaches 88 psig. Consequently, the candidate could incorrectly deduce that the automatic start setpoint for the ECAC is 88 psig. For Part 2, since the crew is attempting to manually start the emergency air compressor (ECAC), the candidate could incorrectly deduce the controller is designed to start the ECAC with only one button.
✗ D. Incorrect but plausible. Part 1 is correct. For Part 2, since the crew is attempting to manually start the emergency air compressor (ECAC), the candidate could incorrectly deduce the controller is designed to start the ECAC with only one button.
Ref: NOS05CONAIR-12 (CONTROL AIR SYSTEM) | LO: 8 — Identify and describe the Control Room controls, indications, and alarms associated with the Control Air System | Source: New | Cognitive: Higher
Connections
- Related systems: Control Air
- Related procedures: AB.CA-0001 — Loss of Control Air
- Related exam: 2018 NRC Written Exam