DOUGLAS

AIRCRAFTCO., INC.

STRUCTURALREPAIR MANUAL

LANDING GEAR - DESCRIPTION AND OPERATION (DC-9-20)

1. General

This section illustrates the doors used to enclose the landing gear
components. Types and gages of material used in construction of the doors
are identified within the illustrations.

° Repair Index

A. A list of structural components and the applicable repairs which may be

used to restore the structural integrity and appearance is presented as
follows:

Structural Component Approved Repairs

Skin Section 52-01, Figure l,

Sheets 2 and 3

Section 52-05, as applicable

Section 53-03, as applicable

Honeycomb Sectioz 52-02, as applicable

Section 52-01, Figure 2,

Sheet l; Figure 3, Sheet 1

Chapter 51, Repair Bonding

Section, as applicable

Internal structure Section 52-01, Figure l,

(frames, stiffeners, Sheet !; Figure 2, Sheet 4
etc.)
Section 52-05, Figures l, 2,
3, and 6 (nose gear door
only)

Section 52-05, Figure 5

NOTE: These repairs do not exclude other repairs, or variations

of repairs shown in the mRnual, that may also apply.

52-83-0
Mar l/T0 Page 1
Printed ,. U S A
 DOUGLASAIRCRAFT CO,, INC.

STRUCTURAL REPAIR MANUAL

"3
2

2
1

14
].5

16
AFT
DOOR
21

19 20
17

18 21 19 I~/17

FORWARD SECTION A-A

DOOR
2O NOTE5:
1. 4iTEM 3 CHEM-MILLEO FROM.080 STOCK,
19 ANDVARIESTO .047 ± .007.
18 2. REFERENCE - DOUGLAS DRAWINGS5910086,
5914985 AND 5914984.
I ITEM NOMENCLATURE GAGE MATERIAL ITEM! NOMENCLATURE GAGE MATERIAL
1 PAN .050 CLAD 2024-T42 13 ATTACHFITTING 2.000 PLATE 7075-T651
2 COVER .O5O CLAD 2024-T3 14 RIB .063 CLAD 7075-T6
3 COVER .080 CLAD 7075-T6 15 RIB .071 CLAD 7075-T6
4 DOUBLER .063 CLAD7075-T6 16 HINGEHALF lx3 STL BAR4140
5 PAN .040 CLAD 2024-T42 17 ANGLE .O5O CLAD7075-T6
6 COVER .O25 CLAD 2024-T3 18 RIB .040 CLAD2024-T42
7 ATTACHFITTING 2 .75x 4 AL BAR 7075-Tb51 19 ’DOUBLER .050 CLAD7075-T6
8 HINGE AL FORGE7075-T6 2O RIB 3x4 ALBAR 7075-T651
9 FITTING 1.000; PLATE 7075-T651 "21 SKIN .040 CLAD 7075-T6
10 ANGLE .050 CLAD 2024-T42 22 SKIN .040 CLAD2024-T3
11 ATTACHFITTING 3x3 STL BAR 4130 23 RIB 1.750 PLATE20 24-T351
12 HINGEHALF 2955883

Nose Gear Door Plating and Structure -- Type C

52-83-0 Figure 1
Page 2 Dec 1/68
P¢,nled ,. U 5 A
 DOUGLASAIRCRAFT CO., INC.

STRUCTURAL REPAIR MANUAL

STA STA
748 ,94

7 (TYP 15
PLACES)

3
6
6
4 8
3
2

38
3, 14
1.5
36
38 40
3
38
35
34 17
.18
32

33
2O

tt

30
STA
"23 694
24
29

NOTE: B, 25
19
FORSECTIONB-B ANDFOR
ITEM LIST OF MATERIALS, 26
SEESHEET2.
*28 26 STA 624
27
BB3-1591

Main Gear Inboard Door Structure -- Type C

Figure 2 (Sheet l) 52-83-o
Dec 1/68 Page 3
 DOUGLASAIRCRAFT CO., INC.
DC-9
STRUCTURAL REPAIR MANUAL

.040 .071 • "28

smcnONB-B

NOTES:
1. STRIP MADEFROMCRESSHEETMIL-S-5059,
ANNEALED,COMP302, FINISH NO. 2D.
2. PRECOATED SAFETY WALK NON-PRESSURE
SENSITIVE, TYPE A, MEDIUMGRIT
3. *SKIN, ITEM 28, CHEMICALLY MILLED FROM.071
CLAD7075-1"6 STOCKANDVARIESTO .040.
4. RAMPASSEMBLY .750 OD X .083, 6061°T6 TUBE
WELDED TO .090, 6061-T6 ANGLES.
5. tl’BUMPER, ITEM 31, IS MADEFROMINVESTMENT
CASTINGBERYLLIUMCOPPER,MIL-C-22087,
COMP10, PONDB.
6. REFERENCE-DOUGLAS DRAWING5910161.

ITEMI NOMENCLATURE GAGE MATERIAL ITEM NOMENCLATURE GAGE MATERIAL

1 CHANNEL .040 CLAD 2024-T4 23 INTERCOSTAL .663 CLAD7075-1"6
,i
2 TUBE SEE NOTE4 24 FORMER .063 CLAD7075-T6
3 STRIP .032 SEE NOTE1 25 FORMER .080 CLAD7075-T6
4 COVER .040 CLAD 2024-T42 26 FORMER .040 CLAD7075-T6
S BUMPER .063 CLAD 2G14-T6 2? ANGLE .0(:~ CLAD 7075-T6
6 COVER .04O CLAD 7075-T6 w28 OUTERSKIN SEE NOTE3
7 SAFETY WALK SEE NOTE2 29 INTERCOSTAL .032 CLAD7075-T6
8 PLATE .080 CLAD 2024-T3 3O INTERCOSTAL .090 CLAD7075-T6
9 COVER .050 CL.AD 7075-T6 tt31 BUMPER/SKID SEE NOTE5
10 SHIM .063 CLAD 2024-T3 32 i .071 CLAD7075-T6
ANGLE
11 SUPPORT .750 PLATE7075-T651 33 ANGLE .125 CLAD7075-T6
12 CHANNEL .050 CLAD 7075-T6 34 FITTING 3.000 AL PLATE7075.-T651
13 HINGE 2926483 35 STIFFENER .050 CLAD7075-T6
14 COVER .071 CLAD 7075-T6 36 STEP .063 CLAD2024-T42
15 HINGE HALF 2916448 37 INNER PANEL .050 CLAD7075-T6
16 SCUFFPLATE .09C CLAD 7075-T6 38 COVER .040 CLAD 2024-T3
m
17 CLIP .080 CLAD 7075-76 39 S~lP .063 SEENOTE1
18 FORMER .O90 CLAD 7075-T6 4O COVER .090 CLAD7075-T6
|m
19 ANGLE 1642726 41 ANGLE 1249328
2O FITTING 5955992 b,L FORGING7075-T6
21 INTERCOSTAL .~71 CLAD 7075-T6
22 STRAP .125 CLAD7075-’1"6
BB3-1592A

Main Gear Inboard Door Structure -- Type C

52-83-0 Figure 2 (Sheet 2)
P~ge h Mar 1/69
Pr,nled ,n U 5 A
 DOUGLASAIRCRAFT CO., INC.

STRUCTURAL REPAIR MANUAL

STA XW58
NOTE:
FORSECTIONE-E ANDF-F,
LIST OF MATERIALSAND
NOTES,SEESHEET2.

7 9 23 8
6 7
4 5
I 1
24
24
SECTION A-A 11

6
9
26

10
13
15 C

8 9 23 6

SECTION B-B
(TYP 3 PLACES) 13
25 12

SECTIONC-C 4 5 2 24 11 7

.... .....
SECTION D-D
8B3-1585A

Main Gear Outboard Door Plating

and Structure -- Type C
Figure 3 (Sheet l) 52-83-0
Mar 1/69 Page 5
Printed ,n U S A
 DOUGLASAIRCRAFT CO., INC.

STRUCTURAL REPAIR MANUAL

16 20 21 t27 18

14 12 13 17
SECTION
E-E
18 V

1~14
SECTION
F-F
NOTES:

1. MADEFROM1.188 T X .125 HEX X .002 THICK ALUMINUM

FOIL HONEYCOMB,NON-PERFORATED.
2. MADEFROMTUNGSTEN BASE, HIGH DENSITYBAR
MIL-T-21014, TYPE2.
3. .003 ALUMINUM ALLOYLAMINATIONS.
4. GLASSCLOTHPHENOLIC,
5. CRESSHEET, MIL-S-5059, COND1/4H, COMP301,
FINISH 2B (OR EQUIVALENT).
6. CRESSHEET, MIL-S-SOS9, GOND1/2H, COMP301,
FINISH 2B ( OREQUIVALENT).
7. f USEDON FUSELAGE
NO. 488, 518 AND519 ONLY.
8’. * ITEM 3 MAYUSE 2.000 PLATE7075-T651 ON
FUSELAGENO. 286 AND SUBSEQUENT.
9. REFERENCE-DOUGLAS
DRAWING5910557.

ITEM NOMENCLATURE GAGE MATERIAL ITEM NOMENCLATURE GAGE MATERIAL L

1 HINGEHALF 2272677 14 OUTERSKIN .050 CLAD 7075-T6
2 BEAM 2923195 15 RUBSTRIP .O2O SEE NOTE6
"3 FITTING 3927055-3 FORGING7075-T6 16 PAN .040 CLAD2014-T’b
4 FITTING 2.000 PLATE 7075-T651 17 CORE SEE NOTE1
5 FITTING 3.500 PLATE 7075-T651 18 PAN .050 CLAD 2014-T6
6 CHANNEL .040 CLAD 2024-T3 19 WEIGHT SEE NOTE2
7 CHANNEL .063 CLAD 2024-T3 20 FITTING 1.500! PLATE 7075-T651
8 SEAL .012 SEE NOTE5 21 SEAL .062 SEE NOTE3
9 INNER
m
SKIN .040 CLAD 2024-T42 22 CLIP .063 CLAD20 24-T42
10 HINGEHALF 2913434 23 CLIP .063 CLAD2024-T3
l OUTERSKIN .040 CLAD 2024-T3 24 SHIM .032 SEE NOTE3
[2 BONDEDDOUBLER .063 CLAD 7075-T6 25 FILLER 1.250 SEE NOTE4
13 BONDEDDOUBLER .050 CLAD 7075-T6 26 SUPPORT .050 CLAD2024-T3
t27 DOUBLER .032 CLAD2024-T3

BB3-1586A
Main Gear Outboard Door Plating
and Structure -- Type C
52-83-0
Figure 3 (Sheet 2)
Page 6
Mar 1/69