PIPER COMANCHE SERVICE MANUAL 2-7. Torque Requirements. The torque values given in Table II-II are derived from oil-free cadmium-Pie threads and are recommended for all airframe installation procedures where torquing is required. unk otherwise noted in sections where other values are stipulated. Engine torque values are found in the latest revision of Avec-Lycoming Service Bulletin No. 268. Propellertorquevaluesarefound in Sections VIl. VilA. VIlB and VIlC of this manual. Table 1I-IlA lists the torque values for flared fittings of various sizes and materials. 2-7a. Torque Wrenches.
Torque wrenches should be checked daily and calibrated by means of weights and a measured lever arm to make sure that inaccuracies are not present. Checking one torque wrench against another is not sufficient and is not recommended. Some wrenches are quite sensitive as to the way they are supported during a tightening operation. Any instructions furnished by the manufacturer must be followed explicitly. CAUTION Do not overtorque fittings. NOTE When flared fittings are being installed, ascertain that the male threads are properly lubricated. Torque fittings in accordance with Table 1l-11A.
When it is necessary to use a special extension or adapter wrench together with a torque wrench a simple mathematical equation must be worked out to arrive at the correct torque reading. Following is the formula to be used: (Refer to Figure 2-8a.) 2-8 Handhold and Walkways. A fixed handhold is located on the right side ofthe fuselage. above the re ... window. Walkways of four parts Devoe non-skid compound and one part black enamel are painted on the right wing and flap. CAUTION Avoid damage to the wings by stepping only on the walkway. 2-9. Ground Handling. 2-10. Introduction to Ground Handling.
Ground handling covers all essential information governing and handling of the airplane while on the ground. This includes jacking, weighing. leveling. mooring. parking. towing and taxiing. When the airplane is handled in the manner described in the following paragraphs. damage to the airplane and its equipment will be prevented. HANDLING AND SERVICING REVISED: 4/10/81 tAl3