C I R R U S LEVELING DESCRIPTION

Transcription

1 LEVELING 1. DESCRIPTION This chapter provides information necessary to properly level the airplane for any of the various maintenance, overhaul, or major repairs which might become necessary. For general longitudinal leveling, the cabin door sill edge is parallel within 0.10 relative waterline 100. The door sill is used in conjunction with a spirit level to determine airplane ground attitude. Serials thru : For specific longitudinal leveling, two forward leveling points are located on either side of the cowl at fuselage station One aft point is located on the tailcone access flange under the horizontal stabilizer on the right side, at fuselage station The leveling points are used in conjunction with a transit to determine ground attitude. Serials & subs, 22T-0001 & subs: For specific longitudinal leveling, two forward leveling points are located on either side of the cowl at fuselage station One aft point is located below the RE1 empennage access panel aft of the horizontal stabilizer, at fuselage station Pegged ruler gauges suspended from the leveling points are used in conjunction with a transit to determine ground attitude. For general lateral leveling, a straight edge may be placed across both cabin door sills. The door sill is used in conjunction with a spirit level to determine airplane ground pitch. For specific lateral leveling, an alignment brace bar may be placed across the upper engine mount weldment attach points. The attach points are used in conjunction with a digital level to determine airplane ground pitch. Page 1

2 2. MAINTENANCE PRACTICES A. Longitudinal Leveling (1) Spirit Level Using Door Sill (See Figure 1) Spirit Level - Any Source Level the airplane. (b) Open LH or RH cabin door. (c) Position and hold spirit level to composite ledge below door sill. (d) To level airplane longitudinally, deflate nose gear tire to center bubble in level. (2) Transit Level Using Fuselage Leveling Points (See Figure 1) Transit Level - Any Source Leveling Ruler Gauge (Pegged), Forward and Aft T620 Cirrus Design Duluth, MN Leveling Aircraft Hydraulic Jack - Any Source Leveling (b) (c) (d) (e) (f) (g) Serials thru : At WL 95.9 on side of fuselage, remove screws at forward longitudinal leveling point located at FS 99.0, and aft longitudinal leveling point located at FS Serials & subs, 22T-0001 & subs: At WL 10.5 on side of fuselage, remove screws at forward longitudinal leveling point located at FS 98.4, and aft longitudinal leveling point located at FS Position pegged ruler gauges at forward and aft longitudinal leveling points. Position aircraft jack at aft tail tie-down. Position and sight transit level on ruler gauges and observe transit level crosshair locations on rulers. To level airplane longitudinally, raise or lower jack as required until transit level is aligned with the same measurement on both ruler gauges. (Refer to 07-10) Page 2

3 WL 100 NOTE At door opening, position spirit level along lower composite ledge located below door seal, to represent pitch axis for pitch attitude. FS 16.8 SPIRIT LEVEL DOOR SILL FS 98.4 AFT Ø 0.25 WL 10.5 FS 06 FORWARD Ø 0.25 Serials & subs, 22T-0001 & subs. WL 10.5 WL WL 95.9 FORWARD Ø AFT Ø FS Serials thru FS 99.0 LEGEND 1. Transit Level 2. Aircraft Hydraulic Jack. Ruler Gauge (Pegged) SR22_MM08_1774C Figure 1 Airplane Leveling - Longitudinal Page

4 B. Lateral Leveling (1) Spirit Level Using Door Sills (See Figure 2) Spirit Level - Any Source Level the airplane. Straight Edge minimum 5.0 ft (1.5 m) Spacer Blocks inches ( cm) - Any Source Level platform. - Any Source Level platform. (b) Remove main landing gear fairings. (Refer to 2-10) (c) Open both doors on airplane. (d) Place spacer blocks on LH and RH door sills so that height of blocks is higher than door seals. (e) Place a straight edge on top and perpendicular to spacer blocks positioned on door sills, centered. (f) Place spirit level on top and parallel to straight edge, centered. (g) To level airplane laterally, deflate main gear tire to center bubble in level. (h) Install main landing gear fairings. (Refer to 2-10) (2) Digital Level Using Engine Mount Weldment (See Figure 2) Engine Mount Leveling Bar T2474 Cirrus Design Duluth, MN Leveling Digital Level - Any Source Leveling (b) Remove main landing gear fairings. (Refer to 2-10) (c) Remove upper engine cowling. (Refer to 71-10) (d) Position leveling bar on upper engine mount weldment. At flat, upper surface of leveling bar, position digital level lengthwise. (e) To level airplane laterally, deflate LH or RH main landing gear tire as required until digital level reads 0. Note: Perform tasks that required leveling prior to leveling equipment removal and cowl reinstallation. (f) Remove digital level and engine mount leveling bar from airplane. (g) Install upper engine cowling. (Refer to 71-10) (h) Install main landing gear fairings. (Refer to 2-10) Page 4

5 SPIRIT LEVEL STRAIGHT EDGE STRAIGHT EDGE STRAIGHT EDGE SPACER BLOCK DOOR SEAL (REF) DOOR SILL DOOR SEAL (REF) DOOR SILL SPACER BLOCK 2 1 NOTE Position spirit level on straight edge so it points outboard, to represent roll axis for roll attitude. Position alignment brace bar at upper engine mount weldment attach points. To level airplane laterally, deflate LH or RH main landing gear tire as required until digital level reads 0. LEGEND 1. Digital Level 2. Engine Mount Leveling Bar SR22_MM08_127C Figure 2 Airplane Leveling - Lateral Page 5

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