Mooney M20TN, Service And Maintenance Manual

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MOONEY AVIATION COMPANY, INC.
M20TN SERVICE & MAINTENANCE MANUAL
Date
2006
Rev Date
Page 10
4. TENSION FITTING REPLACEMENT (Figure
51--8).
A. Cut tubes (A) and (B) loose from tension fitting
340034--7, --8 at welds.
B. Cut existing tube (C) at a 30 degree angle seven
inches from bottom of tension fitting.
C. Cut a replacement tube (C) at a 30 degree angle
and at an appropriate length to position tension fitting.
Weld tension fitting in proper position.
D. Drill four 1/4 inch holes for rosette welds, 1.9
inches from center of 30 degree cut.
E. Make an inner sleeve 5.0 inches long from 4130
steel tube, condition N, with outside diameter to match
inside diameter of tube (C) and with a .085 inch wall
thickness.
F. Insert inner sleeve in tube (C) and weld in place
as shown (Figure 51--8).
5. REPAIRS FOR WELDED ASSEMBLIES -- Gener-
al. This section does not apply to any control system
tubing or assemblies, engine mounts or heat treated
steel components (except as stated below).
A. Small holes up to a #20 drill may be closed by
welding with the inert gas, shielded arc method.
B. Nicks and drill marks that are no longer than 1/8”
and do not exceed four percent of wall thickness, in
depth, after cleanup may be smoothed out and re-
primed. Nicks, holes, and cracks that will clean up with
a #20 drill may be drilled and repaired per item A.
C. The repair of weld beads on heat--treated as-
semblies may be accomplished without reheat treat-
ment within the following limits.
(1) The repair bead will not exceed .375 in length
or 1/3 of total length of weld, whichever is the lesser.
(2) Only one repair per weld bead is allowed.
6. REPAIR OF SPOT WELDS. Failed spot welds on
aluminum may be repaired by installing an AD470--4
rivet through weld if damaged area will clean up with a
#30 drill.
7. DENTS. Small dents which do not exceed five per-
cent of the diameter of the tube, in depth, and are no
longer than one--half tube diameter are acceptable.
TUBE
INSIDE
TUBE
SLEEVE
TUBE
30
.125 IN. WELD GAP
1.9 IN.
5.0 IN. TENSION FITTING
340034--7
2.0 IN.
C
A
B
TUBE
R51--8
TENSION FITTING REPLACEMENT
FIGURE 51--8
51--12--02 -- TAILCONE REPAIRS
1. LONGERON SPLICING. Use procedure outlined
in AC 43.13--( ) for repairing and splicing tailcone lon-
gerons. (Figure 51--9) shows acceptable methods for
splicing longerons. Consult AC 43.13--( ), Figures 2.28,
2.29 and 2.30 for fastener requirements.
2. TAILCONE STRUCTURAL SKIN REPAIR. Repair
minor tailcone skin damage as shown in AC 43.13--( ),
Figure 2.24. The rivet pattern for stressed skin repairs
shall be the same as rivet pattern in skin joint immedi-
ately forward of damaged area. Replace severely dam-
aged structural skin panels. Install new skin panels to
exactly match original skin installation.
51--12--02