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Difficulty: HardSequential Detail Extraction

Read the following technical maintenance procedure:

Before technicians pressurize a newly installed aviation hydraulic accumulator, a strict purging and pre-charging sequence must be executed. First, the reservoir supply valve is isolated to prevent hydraulic backpressure. Immediately following valve isolation, mechanics release any residual nitrogen charge through the manual bleed fitting. After venting the gas chamber to atmospheric pressure, a calibrated dry-nitrogen charging cart is coupled to the high-pressure Schrader valve. Once the connection is securely torqued, technicians slowly introduce dry nitrogen until the system reaches the baseline pre-charge specification of 1,500 psi. Finally, after verifying pressure stabilization, the charging apparatus is disconnected and the protective cap is safety-wired.

Based on the passage, arrange the following maintenance actions in the order they must be performed from first to last.

  1. 1Isolate the hydraulic reservoir supply valve.
  2. 2Release residual nitrogen charge through the manual bleed fitting.
  3. 3Couple the calibrated dry-nitrogen charging cart to the Schrader valve.
  4. 4Introduce dry nitrogen until reaching the baseline 1,500 psi specification.

Answer

The correct procedural order is: isolating the hydraulic reservoir supply valve, releasing residual nitrogen charge through the manual bleed fitting, coupling the calibrated dry-nitrogen charging cart to the Schrader valve, and finally introducing dry nitrogen until reaching the baseline 1,500 psi specification.
The correct sequence follows the strict linear timeline described in the passage: isolating the supply valve occurs first, followed immediately by venting residual nitrogen, then coupling the charging cart after atmospheric pressure is reached, and finally introducing nitrogen to 1,500 psi once torqued.

Step-by-Step Solution

1
Identify the initial precursor event.
The text states 'First, the reservoir supply valve is isolated to prevent hydraulic backpressure.' This establishes isolating the reservoir valve as step one.
Explicit sequential marker 'First' denotes the initial phase of the procedure.
2
Locate the action immediately following the initial step.
The passage notes 'Immediately following valve isolation, mechanics release any residual nitrogen charge through the manual bleed fitting.' This establishes venting residual nitrogen as step two.
The temporal phrase 'Immediately following' directly links residual charge release to the completion of valve isolation.
3
Extract the preparatory hookup milestone.
The text explains 'After venting the gas chamber to atmospheric pressure, a calibrated dry-nitrogen charging cart is coupled to the high-pressure Schrader valve.' This places cart coupling as step three.
The prepositional clause 'After venting...' signals that coupling the charging cart cannot happen until venting is complete.
4
Determine the subsequent charging execution step.
The passage confirms 'Once the connection is securely torqued, technicians slowly introduce dry nitrogen until the system reaches the baseline pre-charge specification...'. This places introducing nitrogen as step four.
The conditional transition 'Once the connection is securely torqued' positions nitrogen introduction after coupling.

Key Concept

Sequential Detail Extraction
Estimated Time:1m 30s
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Sequential Detail Extraction

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