Piper Navajo Service Manual - Piper Navajo PA-31 Service Manual

SECTION XIV
ACCESSORIES AND UTILITIES
14-1. INTRODUCTION. This section covers accessories which are available in this airplane and are not
covered in other sections of this Service Manual. This information provides instructions for remedying
difficulties which may arise in any of the accessories and the instructions are organized so the mechanic may
refer to whichever component or system he must repair or adjust.
The Oxygen System contains service and maintenance procedures. Reference to this portion will aid
the mechanic by providing information, such as the location of the various components, Inspection,
Maintenance, Removal and Installation, Safety Precautions and other information of value, for the proper care
of the system. A troubleshooting Chart at the end of the instructions will help to locate and remedy any
troubles which may arise in the oxygen system.
The B.F. Goodrich Electrical Propeller De-Icing System information provides service and maintenance
procedures for the deicers. This information consists of Inspection, Repair, Removal and Installation of all the
parts which make-up this system. A troubleshooting Chart is incorporated at the end of these instructions to
help in locating any trouble which may arise in this system and its probable cause and recommended remedy
for repair. All work done on the Deicing System must comply with the appropriate Federal Aviation
Regulations.
14-2.
OXYGEN SYSTEM.
14-3. DESCRIPTION AND PRINCIPLE OF OPERATION. The oxygen system for the PA-31 consists of
an oxygen cylinder and regulator, filler valve, pressure gauge, outlets and masks and an ON/OFF control.
High pressure is routed from the cylinder and regulator to the pressure gauge. Low pressure oxygen is routed
from the cylinder and regulator to the outlets and masks whenever the control knob is pulled to the ON position.
Each outlet has a spring-loaded valve which prevents the flow of oxygen until a mask hose is engaged in the
outlet.
14-4. TROUBLESHOOTING. A troubleshooting chart is located at the back of the oxygen system portion of
this section.
14-5. SAFETY PRECAUTIONS. Utmost care must be exercised in servicing, handling and inspection of the
oxygen system. A fully charged oxygen cylinder contains enough pressure to cause serious injury to personnel
and damage to equipment. Keep hands, tools and working area clean and post NO SMOKING signs. Keep all
components of the system free from oil, grease, gasoline, and all readily combustible material. Never allow
electrical equipment to come in contact with the oxygen cylinder. Keep fire and heat away from oxygen
equipment and take care not to generate sparks with carelessly handled tools.
14-6. INSPECTION AND OVERHAUL TIME LIMITS. It is recommended that inspection and overhaul be
conducted by an FAA Approved Station or the manufacturer, Scott Aviation. The following checks and chart
gives recommended inspection and overhaul time for the various parts of the oxygen system.
a. The oxygen cylinder can be identified by the ICC or DOT identification stamped on the cylinder.
The standard weight cylinder (ICC or DOT 3AA 1800) must be hydrostatic tested at the end of each 5 year
period. The lightweight cylinder (ICC or DOT 3HT 1850) must be hydrostatic tested every 3 years. The
lightweight cylinder must be retired from service after 24 years or 4,380 pressurization, whichever occurs first.
The month and year of the last test is stamped on the cylinder beneath the ICC or DOT identification.
b. The outlets should be checked for leakage in the non-use condition and for leakage around an inserted
connector.
c. The high pressure gauge may be checked for accuracy by comparing its indicated pressure with
that of a gauge of known accuracy.
Revised: 2/18/94
ACCESSORIES AND UTILITIES
5E5
PIPER NAVAJO SERVICE MANUAL