TABLE 7-13. TABLE OF NUTS (CONTINUED) Nut Part Number Description Nut Part Number Description MS9951 Nut, spanner, end MS21047-21048 Nut, self-locking, plate, slots, two lug, low ht.
cup washer locked, AMS 6322 MS16203 Nut, plain, hex. MS21049-21050 Nut, self-locking.
Nonmagnetic plate, two lug 100° csk., low ht.
MS17825-17826 Nut, self-locking, MS21051-21052 Nut, self-locking, castle, hex. Regular plate, one lug, and thin low ht.
MS17828 Nut, self-locking, MS21053-21054 Nut, self-locking, nylon insert, 250°, plate, one lug, regular ht., monel 100° csk.
MS17829-17830 Nut, self-locking MS21055-21056 Nut, self-locking.
Tylon Insert, 250° plate, corner, low ht.
regular ht., cres. Steel steel MS19067-19068 Nut, plain, MS21057-21058 Nut, self-locking.
round, retaining plate, corner, 100° csk MS20341 Nut, electrical, MS21059-21060 Nut, self-locking, plain, hex. plate, two lug ot floating, low ht.
MS20364 Nut, self-locking, MS21061-21062 Nut, self-locking 250 °F, thin plate, floating low ht., one lug MS20365 Nut, self-locking, MS21069-21070 Nut, self-locking.
250° F, regular plate, two lug low ht., reduced rivet spacing MS20501 Nut, plate, MS21071-21072 Nut, self-locking, self-locking. plate, one lug, low ht., two lug reduced rivet spacing MS21025 Nut, MS21073-21074 Nut, self-locking, castellated bearing. plate, corner, retaining reduced rivet spacing Par 7-195 Page 7-73
TABLE 7-13. TABLE OF NUTS (CONTINUED) Nut Part Number Description Nut Part Number Description MS21078 Nut, self-locking, MS27130-27131 Nut, blind, rivet, plate, two lug, flathead., open nylon insert and closed end MS21080 Nut, self-locking, MS27151 Nut, stamped plate, one lug, nylon insert MS21081 Nut, self-locking. MS27955 Nut, spanner, plate, corner, plain, round nylon insert MS21083 Nut, self-locking, MS35425-35426 Nut, wing hex., nylon insert plain & drilled MS21340 Nut, plain, hex., MS35649-35650 Nut, plain hex.
electrical, thin, wire holes MS21917 Nut, sleeve coupling, MS35690-35691 Nut, plain hex.
flareless MS21921 Nut, sleeve coupling, MS35692 Nut, slotted hex.
flareless MS24679-24680 Nut, plain cap MS51967-51972 Nut, plain, hex.
low & high crown MS25082 Nut, plain, thin, MS90415 12 point captive washer Nut, self-locking, hex., electrical MS27040 Nut, plain square MS172236-172270 Nut, spanner, bearing, retaining MS27128 Nut, plain, welding MS172321-172370 Nut, spanner Par 7-195 Page 7-74
TABLE 7-13. TABLE OF NUTS (CONTINUED) Nut Part Number Description Nut Part Number Description NAS395-396 Nut, U type NAS577-578 Nut, self-locking floating barrel retainer NAS443 Nut, self-locking, NAS671 Nut, plain hex., int. wrenching small pattern NAS444-445 Nut, double lug NAS680-681 Nut, plate, anchor type, offset self-locking, two lug NAS446 Nut, flat type NAS682-683 Nut, plate, self-locking, one lug NAS447-448 Nut, plate, NAS684-685 Nut, plate, corner, self-locking self-locking NAS449 Nut, anchor type NAS686 Nut, plate, self-locking, two lug, floating NAS450 Nut, plate, NAS687 Nut, plate, self-locking self-locking, one lug NAS463 Shim, NAS688-695 Nut Assembly, B0000 plain anchor nut self-locking, gang channel NAS487 Nut NAS696 Nut, plate self-locking, instrument mount one lug, miniature NAS500 Shim, anchor nut, NAS697 Nut, plate, csk. self-locking, two lug, miniature NAS509 Nut, drilled NAS698 Nut, plate, corner, self-locking, miniature Par 7-195 Page 7-75
TABLE 7-13. TABLE OF NUTS (CONTINUED) Nut Part Number Description Nut Part Number Description NAS1021-1022 Self-locking Nut, NAS1098 Nut, tube fitting hex., regular and low ht.
NAS1023-1024 Nut, plate, NAS1287-1288 Nut, hexagonal, self-locking, self-locking, nut and two lug washer shear pin NAS1025-1026 Nut, plate, NAS1291 Nut, hexagonal, self-locking, self-locking.
one lug low height NAS1027-1028 Nut, plate, corner, NAS1329 Nut, blind rivet self-locking flathead, internal thread NAS1029-1030 Nut, plate, self-locking, NAS1330 Nut, blind rivet, csk. Head one lug, two lug internal thread NAS1031 self-locking, Nut, plate, NAS1408-1409 self-locking. Nut, hexagonal, two lug, floating regular height coarse and fine thr.
NAS1032 Nut, plate, NAS1410 Nut, tube fitting self-locking, one lug, floating NAS1033 Nut, plate, right angle, floating, self-locking NAS1423 Nut, plain, thin hex., drilled jamnut NAS1034-1041 Nut Assembly, self-locking, NAS1473 Nut, plate, gang channel self-locking. two lug.
cap floating NAS1067 Nut, plate, self-locking one lug, miniature NAS1474 Nut, plate, self-locking, two lug, cap floating, reduced rivet spacing NAS1068 Nut, plate, floating, self-locking, NAS1512-1513 Nut, plate, two lug, miniature self-locking gang channel Par 7-195 Page 7-76
Par 7-195 Page 7-77 TABLE 7-13. TABLE OF NUTS (CONTINUED)
TABLE 7-14. TABLE OF WASHERS Washer Number Description Washer Humber Description AN 935 Washer, lock, M S9081 Washer, key dbl.
spring Bearing retaining AN 936 Washer, M S9274 Washer, key, obl.
tooth lock Bearing ret. Cres.
AN 950 and 955 Washer, M S9276 Washer, key, cres.
1O10 ball socket, ball seat 180° locking AMS 5510 AN 960 Washer, flat M S9320-9321 Washer, fat AMS 6350 and 5510 AN 961 Washer, M S9482 Washer, flat, flat electrical steel AM S 6437 (Brass, silver or or AMS 6485 tin-plated) diffused nickel cad.
Chak AN 970 Washer, M S9549 Washer, flat, fat, wood AMS 5510 AN 975 Washer, fat M S9581 Washer, key, cres.
AMS 5510 90° locking AN 801 3 Washer, insulator M S9582 Washer, key, cres. AMS 5510 270° locking AN 122576-122600 Washer, M S9684 Washer, cup, lock plain steel cres. AMS 5510 M S9768 Washer, flat, cres. AMS 5525 and AMS 5737 csk.
M S9880 Washer, cup, lock cres.
AMS 5510 Par 7-195 Page 7-78
TABLE 7-14. TABLE OF WASHERS (CONTINUED) Washer Number Description Washer Number Description M S9952 Washer, cup, lock, MS28777 Washer, hydraulic, spanner nut, cres. packing backup AMS 5646 M S15795 Washer, flat, MS35333-35334 Washer, lock, met al flat intemal tooth, light and heavy M S17811 Washer, MS35335-35336 Washer, lock, thrust, steel flat and csk., external tooth M S19069-19070 Washer, key, MS35337-35340 Washer, lock, retaining med., light, heavy M S20002 Washer, plain, csk., hi-strength MS35790 Washer, lock, 100° csk., ext. tooth MS21258 retaining, steel Washer, key, MS122026-122075 lock spring Washer, M S25081 Washer, key MS172201-172235 Washer, key, single bearing, retaining M S27051 Washer, slotted MS172271-172320 Washer, key, single GI M S27111 Washer, finishing, NAS70 Washer, plain countersunk NAS143 Washer, M S27129 Washer, finishing, csk., 80°, 82° 00 osk. and plain MS27183 Washer, flat, NAS390-391 Washer, finishing round Par 7-195 Page 7-79
TABLE 7-14. TABLE OF WASHERS (CONTINUED) Washer Number Description Washer Number Description NAS460 Washer, tabtype NAS1587 washer, 1200 °F, plain and csk.
NAS513 Washer, rod end NAS1598 Washer, sealing locking, steel NAS549 Washer, flat, NAS1636 Washer, resin tiber key dual tab NAS620 Washer, flat, NAS1640 Washer, lock, spring, reduced O.D. nonm ag netic NAS1061 Washer, hitemp, lock, spring NAS1099 washer, bevel 9 1/2° NAS1169 Washer, dimpled 100° NAS1197 Washer, flat, 5052 aluminum NAS1252 Washer, fat NAS1401 Washer, radius, al.
Alloy, steel, cres. Steel NAS1515 Washer, plastic and rubber Par 7-195 Page 7-80
TABLE 7-15. TABLE OF PINS Pin Number Description Pin Number Description AN253 Pin, hinge AN416 Pin, retaining safety AN380 & 381 Pin, cotter AN122676-122775 Pin, dowel steel AN385 Pin, AN121601-121925 Pin, flathead devis plain taper .125 -500 drilled shank AN386 Threaded taper pin AN150201-150400 pin, lock, steel, brass AN392-406 Pin, fathead M S9047 Pin, spring, steel, phoshated finish
• AN415 Pin, lock M S9048 Pin, spring, steel, cadmium plate M S9105 Pin, lock IO M S9164 Pin, straight, steel, headless, oversize M S9245 Pin, cotter, cres. AMS 7211 M S9389 Pin, straight, headless, lock, AMS 5735 M S9390 Pin, straight, headless, cres. AMS 5735, dowel std. & O.S.
Par 7-195 Page 7-81
TABLE 7-15. TABLE OF PINS (CONTINUED) Pin Number Description Pin Number Description MS9462-9468 Pin, straight MS35810 Pin, clevis, hd. AM S 5735 headed MS9486 Pin, draight, headless, MS 39086 Pin, spring, lock, AMS 5132 tubular coiled MS9842-9848 Pin, draight, MS51 923 Pin, pring, headed, AMS 5616 tubular coiled MS16555 Pin, straight, headless 0002 MS51 987 tubular coiled over nominal size MS16556 Pin, draight, headless 001 over nominal size MS171401-171900 Pin, spring, SS, steel MS16562 Pin, spring, tubular, slotted NAS427 Pin, pulley guard, steel, al. Alloy MS17984-17990 Pin, quick release, NAS561 Pin, spring slotted positive lock and colled, heavy duty MS20253 Pin, hinge NAS574 pin, rear mounting MS20392 Pin, straight, headed, drilled NAS607 Pin, headless, dowel, steel MS24665 Pin, cotter NAS1 292-1296 Pin, shear thread 100° flush head MS35671-35679 Pin, grooved, headless, NAS1 322 Pin, shear thread, tapered groove protruding head Par 7-195 Page 7-82
TABLE 7-15. TABLE OF PINS (CONTINUED) Pin Number Description Pin Number Description NAS1332-1346 Pin, quick release NAS1535-1542 Pin, swage lock, 100° hd., tension, pul type, alum.
NAS1353-1366 Pin, quick release, NAS1546-1552 Pin, swage lock, positive locking, 100° hd., tension, double acting stump type, alum.
NAS1407 Pin, spring, NAS1583 Pin, 100° csk. hd., coiled hi-shear rivet, 1200 F NAS1436-1442 Pin, swage lock, NAS1584 Pin, fathead, 0000000000001 100° shear head, pull type, steel hi-shear rivet, 1200 F NAS1446-1452 Pin, swage lock, protruding head, pull type, steel NAS1456-1462 Pin, swage lock, 100° head, pull type, steel NAS1465-1472 Pin, swage lock, protruding head, OSCOIN pull type, steel NAS1475-1482 Pin, swage lock, 100° head, pull type, steel NAS1486-1492 Pin, swage lock, 100° head, stump type, steel NAS1496-1502 Pin, swage lock, stump type, steel protruding head NAS1525-1532 Pin, swage lock, protruding head, al. alloy
7-196.-7-206. [RESERVED.] Par 7-195 Page 7-83
Par 8-1 Page 8-1 CHAPTER 8. ENGINES, FUEL, EXHAUST, AND PROPELLERS SECTION 1. ENGINES
8-1. GENERAL. Consult the manufacturer’s manuals, Service Bulletins (SB), and instruction books regarding the repair and overhaul, inspection, installation, and maintenance of aircraft engines for that particular make, model, and type of engine. This section lists acceptable inspection and repair procedures that may be used in the absence of an engine manufacturer’s maintenance information.
8-2. SPECIAL INSPECTION. A visual inspection is needed to determine the condition of the engine and its components. An annual or 100-hour inspection should include the engine and nacelle group as follows.
a. Cold Cylinder Check. If an engine is running rough, the cause may be a bad ignition lead, a spark plug not firing, a partially clogged fuel injector, or a bad magneto. The dead cylinder will be colder than the surrounding cylinders and can be quickly determined by using the recommended cold cylinder checks. This should be done using a thermocouple probe, which is very sensitive to small differences in temperature, which is the case with a partially clogged injector. For a carbureted engine, the following check may be helpful:
(1) Using experienced personnel, run the engine on the bad magneto for approximately 30 seconds at 1200 revolutions per minute (rpm). Without switching the magneto switch back to both shut off the engine. Have another mechanic use a grease pencil (non-carbon) and quickly mark each exhaust stack approximately 1 inch from the flange that holds the exhaust stack to the cylinder. Next, check the exhaust stacks and look for the exhaust stack whose grease pencil mark has not turned to a grayish-white or ash color. This is the cold cylinder.
(2) The probable cause of the cold cylinder is either a defective spark plug or ignition lead. Switch the spark plugs to another cylinder and run the test again. If the problem stays with the original cylinder, the problem is either the ignition lead or the magneto.
b. Piston Engine Sudden Stoppage Inspection. Sudden stoppage is a very rapid and complete stoppage of the engine. It can be caused by engine seizure or by one or more of the propeller blades striking an object in such a way that rpm goes to zero in less than one complete revolution of the propeller. Sudden stoppage can cause internal damage to constant-speed propellers; reduction drive; gear train damage in the accessory section; crankshaft misalignment;
or damage to accessories such as magnetos, generators, vacuum pumps, and tach generators.
(1) Every engine that suffers a sudden stoppage must be inspected in accordance with the manufacturer’s maintenance instructions before being returned to service.
(2) If the engine manufacturer does not provide the required information, then the engine case must be opened, and every major component part must be inspected using visual and/or nondestructive inspection (NDI) procedures as applicable.
(3) The sudden-stoppage inspections include checking for cowling, spinner, and airframe cracks and hidden damage and alignment of the engine mount to the airframe, the