Maintenance
06-236115-001 5-3 October 2014
5-4.2.3 Inspect hoses
Inspect 1/4-inch flexible actuation hoses for loose fittings, damaged threads, cracks,
distortion, cuts, dirt and frayed wire braid. Tighten loose fittings and replace hoses with
stripped threads or other damage. If necessary, clean parts as directed in Paragraph 5-6.1.
Inspect the adapters, couplings and tees at the HFC-227ea cylinder pilot outlets and tighten
couplings if necessary. Replace any damaged parts.
5-4.2.4 Inspect Pressure Control Heads
Inspect HFC-227ea cylinder pressure operated control heads for physical damage,
deterioration, corrosion, distortion, cracks, dirt and loose couplings. Tighten loose couplings.
Replace damaged caps. Replace the control head if damaged. If necessary, clean as directed
in Paragraph 5-6.1.
5-4.2.5 Inspect Electric Control Heads
Inspect the HFC-227ea cylinder electric control heads for damage, corrosion, and dirt. Check
the control heads' flexible electrical line for wear and damage. Check the control head for loose
coupling and tighten if necessary. Check that the indicator is in the SET position, the pull pin
is installed in the manual lever, and the seal wire is intact. Replace the control head if
damaged. If necessary, clean as directed in Paragraph 5-6.1
5-4.2.6 Inspect Cylinder and Valve Assembly
Inspect the HFC-227ea cylinder and valve assembly for leakage and physical damage such as
cracks, dents, distortion and worn parts. Check the burst disc and pressure gauges for damage.
Replace damaged gauges or burst disc per Paragraph 6-2.7 or Paragraph 6-2.8. If the gauge
pressure is not normal (360 PSIG at 70°F [25 bar gauge at 21°C]), remove and recharge the
cylinder as instructed in Paragraph 5-7 and Paragraph 6-3. If damaged parts are found on the
HFC-227ea cylinder or cylinder valve, replace the HFC-227ea cylinder. If necessary, clean the
cylinder and associated parts as directed in Paragraph 5-6.1.
5-4.2.7 Inspect Brackets, Straps, Cradles and Mounting Hardware
Inspect the HFC-227ea cylinder brackets, straps, cradles and mounting hardware for loose,
damaged or broken parts. Check the cylinder brackets, straps and associated parts for
corrosion, oil, grease and grime. Tighten any loose hardware. Replace damaged parts. If
necessary, clean as directed in Paragraph 5-6.1.
5-4.2.8 Inspect Discharge Hoses
Inspect The flexible discharge hoses for loose fittings, damaged threads, cracks, rust, kinks,
distortion, dirt and frayed wire braid. Tighten loose fittings and replace hoses with stripped
threads. If necessary, clean as directed in Paragraph 5-6.1.
5-4.2.9 Inspect Actuation Line
Inspect the nitrogen actuation line (if used) and support brackets for continuity, physical
damage, loose fittings, distortion, cracks or cuts. Tighten loose fittings. Replace damaged
parts. If necessary, clean as directed in Paragraph 5-6.1.
WARNING
Before resetting the lever/pressure operated control head, all pressure must be
relieved from the cylinder and actuation lines.
Pressure can be relieved from unvented actuation tubing by loosening the
fitting on the control head slightly and allowing the line to bleed out completely.
Failure to perform this action can result in damage to the control head.
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