Feb
PAGES
Feb 1/98
LIST
OF
EFFECTIVE
SUBJECT
Inspectionof Flexible Hoses Consumable Materials VendorInformation EngineTorque Values Torque Requirements Lubricationof Threads Lubricationof Gaskets and Seals DecimalConversion Special Torques TorqueConversions MetricConversions Drill Sizes
PIPER AIRCRAFT PA-42-720(AdvancedTrainer) MAINTENANCEMANUAL
CHAPTER91 -CHARTS
TABLE OF CONTENTS
CHAPTER PAGE
91-00-00 1 3 12 14 15 18 18 19 20 21 23 26
EFFECTIVITY: 040-999
CONTENTS
Jan10/90
PIPER AIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL
Charts
A. Inspectionof Flexible Hoses
NOTE: During the manufacturing process, a condition known as "rubber strike-through" occasionally occurs. This condition is such that rubber material protrudes through the wire braid cover. This condition has no effect on hose quality.
It is recommended that flexible hoses be inspected every 100 hours, especially those in the engine compartments.Wheninspecting hoses, look for the following conditions:
1. Check each installation to be sure the hose is not kinked, twisted, or distorted. Check for evidence of abrasion, cuts, and broken wires. Random broken wires are acceptable since wire breaks sometimesoccur during manufacture. Discard hose if two or more broken wires are found per plait (braid) or more than six broken wires per lineal foot. Broken wires in an area where kinking is evidentis also a cause for rejection.
CAUTION: Puncturingthe outer cover of the hose may cause damage to the hose.
2.
Check each assembly for deterioration, ply separation of cover or braid, cracks, weather checking, lackof flexibility, blisters or bulging, collapse, or sharp bending. Blisters on the outer synthetic coverdo not necessarily indicate a faulty hose.
3.
Remove hose from assembly if hose shows any visible wear. Inspect hose interior and check for signs of deterioration, tube collapse, cut rubber, wire braid puncture, or restriction. To inspect hoses with elbow fittings, use flexible inspection light and viewer, or inspection ball as described in Chart 1. Replace hose if any deterioration exists.
CHART 1
BALL DIAMETERS FOR TESTING HOSE RESTRICTIONS
Hose Size Ball Size
-4 ........................................................... 5/64
-5 ........................................................... 9/65
-6 ................... ....................................... 13/64
-8 ........................................................... 9/32
-10 ........................................................... 3/8
-12 ........................................................... 1/2
-16 ......................................................... 47/64
-20 ......................................................... 61/64
EFFECTIVITY:
91-00-00Jan10/90
PIPERAIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL
A. Inspectionof Flexible Hoses(continued)
CHART 2
HOSE SPECIFICATIONS
SINGLE WIRE BRAID FABRIC COVERED
TUBE HOSE HOSE RECOMM MIN MAX MIN MIL SIZE SIZE SIZE OPER. BURST PROOF BEND
PART NO.
O.D. I.D. O.D. PRESS PRESS PRESS RADIUS
MIL-H-8794-3-L 3/16 1/8 .45 3,000 12,000 6,000 3.00
MIL-H-8794-4-L 1/16 3/16 .52 3,000 12,000 6,000 3.00
MIL-H-8794-5-L
5/16 1/4 .58 3,000 10,000 5,000 3.38
MIL-H-8794-6-L 3/8 5/16 .67
2,000 9,000 4,500 4.00
MIL-H-8794-8-L 1/2 13/32 .77 2,000 8,000 4,000 4.63
MIL-H-8794-10-L 5/8 1/2 .92 1,750 7,000 3,500 5.50
MIL-H-8794-12-L 3/4 5/8 1.08
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