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Difficulty: MediumDirect Fact Retrieval

The BAK-12 aircraft arresting system is installed along military runways to safely decelerate tactical aircraft during emergency landings. The system utilizes two synchronized energy absorbers positioned on opposite sides of the runway, connected by a steel purchase tape to a pendant cable. When an aircraft's tailhook engages the pendant, the purchase tape unspools against a modulated hydraulic braking force. To prevent tape binding, technicians must inspect the hydraulic brake pressure relief valves every 30 days and replace the sacrificial bronze friction pucks whenever wear exceeds a thickness threshold of 0.125 inches.

According to the passage, what specific maintenance action must be performed every 30 days?

  1. A
    Replace the sacrificial bronze friction pucks
  2. Inspect the hydraulic brake pressure relief valvesAnswer
  3. C
    Calibrate the purchase tape unspooling tension to 0.125 inches
  4. D
    Flush the hydraulic fluid in both synchronized energy absorbers

Answer

Technicians must inspect the hydraulic brake pressure relief valves every 30 days.
The author explicitly states that technicians must inspect the hydraulic brake pressure relief valves every 30 days to prevent tape binding.

Step-by-Step Solution

1
Locate the chronological time marker in the passage
Identified the phrase 'every 30 days' in the final sentence.
The question asks for a specific maintenance action associated with a 30-day recurring interval.
2
Extract the exact action paired with the identified time interval
Found 'inspect the hydraulic brake pressure relief valves'.
Direct fact retrieval requires matching the exact detail stated without extrapolation.

Key Concept

Direct Fact Retrieval
Estimated Time:1m 0s
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