PS-28 Cruiser
PS-28N Cruiser
CR-MM-1-0-00
CHAPTER 15 – AIRPLANE REPAIRS
Revision No.: -
Date of issue: 2011-03-08
15 - 20
Bolt size
Torque limits recommended
Max. allowable torque limits
Nm
in lb
Nm
in lb
AN3
2.3 - 2.8
20 - 25
4.5
40
AN4
5.7 - 7.9
50 - 70
11.3
100
AN5
11.3 - 15.8
100 - 140
25.4
225
AN6
18.1 - 21.5
160 - 190
44.1
390
AN7
50.9 - 56.5
450 - 500
94.9
840
AN8
54.2 - 78
480 - 690
124.3
1100
AN9
90.4 - 113
800 - 1000
180.8
1600
Tab. 15-9
: Recommended torque values for oil-free, cadmium-plated threads
15.8
Securing the bolt joints
15.8.1
General
Bolt joint securing is used in order to prevent from their loosening due to vibration or force
action on the connected parts, which could result in the damage of the connected parts.
Three ways of bolt joint securing are used on the airplane: locking wire, cotter pin and
locking washer.
15.8.2
Bolt joint securing by locking wire
Procedure of bolt joint securing is shown on the Fig.15-6 and Fig.15-7. The zinc-coated or
stainless steel wire having diameter of 0.8 mm (
0.032in
) is used for securing.
Fig. 15-6
: Ways of bolt joint securing
