The Handling, Service, and Maintenance section describes  the maintenance and inspections recommended by the  manufacturer (and the regulations). Additional maintenance  or inspections may be required by the issuance of ADs  applicable to the airframe, engine, propeller, or components.  This section also describes preventive maintenance that  may be accomplished by certificated pilots, as well as the  manufacturer’s recommended ground handling procedures. It  includes considerations for hangaring, tie-down, and general  storage procedures for the aircraft.  The Supplements section contains information necessary  to safely and efficiently operate the aircraft when equipped  with optional systems and equipment (not provided with the  standard aircraft). Some of this information may be supplied  by the aircraft manufacturer or by the manufacturer of the  optional equipment. The appropriate information is inserted  into the flight manual at the time the equipment is installed.  Autopilots, navigation systems, and air-conditioning  systems are examples of equipment described in this section.  [Figure 9-7]  Figure 9-7.  Supplements provide information on optional equipment.  Handling, Service, and Maintenance (Section 8)  Supplements (Section 9)  Figure 9-6.  Stall speed chart.  60  50  40  70  30  2,400 2,200 2,000 1,800 1,600 0° 20° 40° 60° Stall speed (knots)  Gross weight (pounds)  Angle of bank (degrees)  0° Flaps 0° Flaps 40° Flaps Maximum weight - 2,440 (pounds)  Calibrated stall speed Indicated stall speed EXAMPLE Gross weight: 2,170 pounds Angle of bank: 20° Flap position: 40° Stall speed, indicated: 44 knots  40° Flaps 9-5 