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DECEMBER 24, 2008

MODEL CESSNA 152

1.0 AIRCRAFT DESCRIPTION

1.1 ROAD RUNNER WHEEL WEIGHER 10,000 LBS FROM SITECHNOLOGIES

a. Calibration date : 24/01/2007

b. Calibration due date : 24/01/2008

c. Indicator S/N : M1681C

d. Indicator P/N : 8500914-01

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e. KIT Model : AW10000-3

f. Kit S/N : M1681C

Plus 3 weighing pads with 6 stoppers.

1.2 AIRCRAFT : MODEL CESSNA 152

a. Registration : N757MW

b. Horse power : 110HP

c. Top Speed : 110 kts

d. Cruise Speed : 107 kts

e. Gross weight : 1670 lbs

f. Empty weight : 1141 lbs

g. Fuel capacity : 26.00 gals

2.0 TOOLS AND EQUIPMENT USE FOR AIRCRAFT WEIGHT AND

BALANCE

NO. TOOLS AND EQUIPMENT QUANTITY

1. Light fixed-wing aircraft 1

2. Aircraft jack As required

3. Bottle jack As required

4. Jack adapter 35. Weighing scale 1

6. Chocks 6

7. Plum bob 2

8. Measuring tape 1

9. Spirit level 2

10. L Engineering square 1

11. Chalky line 1

12. Chalk 4

13. Tire inflator and gauge 1

14. Nitrogen gas bottle + chuck key 1

15. Electrical wire cable/connector 1

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3.0 AIRCRAFT DEFUELING

NO. TOOLS AND EQUIPMENT QUANTITY

1. Empty container(cleaned) As required

2. Filter + funnel 1 each

3. Step 2

4. Ground bonding 2

5. Rags As required

6. Fire extinguisher 1

7. Hand tools As required

4.0 AIRCRAFT WASHING

NO. TOOLS AND EQUIPMENT QUANTITY

1. Soap cleaner As required

2. Water spray gun 1

3. Rags and sponge As required

4. Masking tape 2 rolls

5. Cleaning solvents As required

Some Tools And Equipment Used For Weighing Aircraft

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Chocks

5.0 AIRCRAFT WEIGHING PROCEDURES CHECKLIST

5.1 PREPARATION

a) All the required data have to be obtained with regard to weighing TCDS etc...

b) Aircraft fuel has to be checked. If it not empty, the fuel have to be drained / top up

to the required specification

c) During cleaning the aircraft / washing;

Safety

All static port and pitot have to be covered before cleaning

Approved detergent / soap must be used All brushes and rags used must be cleaned from dirt / sand or FOD

d) Aircraft must be put in a close hangar on the level ground.

e) Equipment list or ballast have to be checked refer TCDS

f) All tires have to be inflated to the recommended operating pressure refer

maintenance manual

In the maintenance manual:

Main wheel 21 psi

Nose wheel(standard) 30 psi

Nose wheel(optional) 35 psi

g) Front seat have to be placed in forward position with seat back in most nearly

vertical position

h) Aircraft date of registration have to be checked refer TCDS Prior 1st March

1978 : Drain oil and operating fluid

i) Control surfaces must be placed in neutral position

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The Amount Of Fuel In The Aircraft Has To Be Checked

All The Cable Has To Be Inserted Correctly According To Their Colours

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All Equipment Has To Be Set As Shown Above

Checking The Tire Pressure

Control Surface Has To Be Placed In Neutral Position

5.2 CALIBRATE THE WEIGHING SCALE

a) The reading on the scale must be zero

b) The chocks have to be weighed and recorded / tare weight

*Note : Get instructor approval

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Make Sure That The Reading On The Weighing Machine Must Be Zero

5.3 LEVEL THE AIRCRAFT

a) Read the manufacturer instructions and TCDS

b) Aircraft have to be leveled laterally using spirit level and the level condition of

the aircraft have to be adjusted by deflating or inflating the struts / tires of the

main landing gears using nitrogen gas;

Safety

Avoid any contact with aircraft The regulator must be adjusted slowly during charging the strut and the

strut have to be released slowly

c) Aircraft must be leveled horizontally / longitudinally using spirit level condition

of the aircraft by deflating or inflating the oleo struts of the nose gear using

nitrogen gas;

Safety

Avoid any contact with the aircraft

The regulator must be adjusted slowly during charging the strut send the

strut have to be released slowly.

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Level The Aircraft Using Spirit Level And The Spirit Level Should Be Placed In

Longitudinal

5.4 READING WEIGHING SCALE

a) The weight of the aircraft shown on the scale for each gear was read;

Safety

Make sure the scale has been calibrated/zero

Make sure the unit used or shown on the scale is correct (lbs/kgs) and get

at least minimum of three readings to get the average.

Avoid contact with the aircraft

b) All tare weight must be deducted, if applicable from each readingc) The value had to be recorded in weight and balance form

5.5 MEASURING THE DATUM

a) Read TCDS the position of datum

b) Using the plum bob, chalk and measuring tape, the datum and the weighing point

have been marked, using chalk line or chalky string

c) The distance of the nose gear and both the main landing gears was measured from

the datumd) All the measurement were recorded

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Placing The Plum Bob Inline With The Main Wheels And Mark

Use L Engineering Square Together With The Plum Bob So That The Correct Marking

Is Obtain

After The Marking Is Obtain Join Both Marking Point Using Chalk Line

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Make The Center Line Between The Joining Lines

Measure The Distance Of Aft And Forward And Mark The Datum

5.6 HOUSE KEEPING/TIDY UP

a) All the weighing scale has to be removed from the aircraft

b) The fuel has to be filled up / replenish as per TCDS, and the tire have to be inflated

too;

Safety

Use approved and correct type for fuel an oil

Install bonding strip/cable to prevent electrical-static build up

c) The area has to be cleaned.

d) All tools and equipment used have to be returned back to the tool store.

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5.7 CALCULATION AND DATA ENTRY

a) The empty weight (EW) and empty weight center of gravity (EWCG) were

calculated and recorded in the weight and balance form.

b) The maximum gross weight of the aircraft were found and the useful load of the

aircraft were calculated.

c) The weighing form has to be signed

d) The latest aircraft weight and balance data have to be recorded in the log book and

sample of aircraft log sheet

e) The aircraft log book and aircraft log sheet were signed.

f) A report of my finding result have to be made / conclusion

6.0 PROCEDURES OF USING A ROAD RUNNER WHEEL WEIGHER

1. Connect Weighing Pad cable into the corresponding connector on the side of the

indicator. Make sure the color code on pads, cables and indicator inputs are

match(SCALE 1 Main Wheel Landing Gear (Left)-RED Cable, SCALE 2 Main

Wheel Landing Gear (Right) -GREEN Cable and SCALE 3 Nose Wheel Landing

Gear-YELLOW Cable).

2. Turn ON the indicator POWER and leave it about 5 minutes (Warming Up).

3. Place the TIRE STOPPER on the Weighing Pad.

4. With no load on the scale, adjust the ZERO for each channel. Switch the channel

ON and let the other channel OFF. With no Weight/load on the Weighing Pad,

use the ZERO KNOB for that channel to set the display to 00000.5. Press the TEST button and compare the reading with the TEST number for that

channel. The TEST number was recorded inside the cover of indicator. This is to

verified that the scale of was electrically intact and the calibration has not been

tampered.

6. Repeat Step 4 and step 5 for each of the other channel.

7. The scale is ready to use.

8. Placed the ramps about 1-2 inches in front of all wheels. Push the aircraft until all

wheels reach on weighing pads. Immediately, put the TIRE STOPPER behind all

the wheels. The indicator start displayed the weight.

9. To find the weight of each load on Weighing Pad, press the channel SCALE 1,and

the indicator will display the total weight of SCALE 1(Main Wheel Landing Gear

(Left) )Take the reading. Do the same thing on channel SCALE 2 and 3.

10. By using a measurement tape, measure the distance from the center of nose

wheel landing gear to the reference datum line parallel to the aircrafts

longitudinal centerline. Also measure the distance from the center of both main

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wheel landing gears to the reference datum line parallel to the aircrafts

longitudinal centerline. Record all the results.

11. Remove all the cable and put into the box. Remove the TIRE STOPPER and push

the aircraft slowly to its place. Stored all the equipment and clean the workplace.

7.0 WEIGHING USING PLATFORM SCALES AND RAMPS

8.0 CALCULATION

STEP NO. DESCRIPTION

1 All items that do not have a fixed location in the aircraft has to be removed.

(eg. Tools, books, manuals, headset etc ).

2 Aircraft has to be leveled using procedures in the Service Manual and the

main wheel has to be chocked.

3 Plum bob has to be removed from the center of axles and mark the

location on the floor.4 The chocks and the plum - bob has to be removed and the aircraft has to be

moved as necessary to gain access to the chalk marks.

5 Mark a chalk line between the main wheel axle marks using a chalky line /

string.

6 Mark the midway point between the main wheels. Extend a line from this

point to center line of the nose wheel. Extend the firewall mark to intersect

this line. Use a carpenters square, if necessary.

7 Measure from the firewall mark (datum) to the nose wheel CL (center

line). Make another measurement from the datum to the line drawn

between the main wheels. Records the measurements for later calculations.8 Zero scales, weigh and record applicable tare weight on the weight and

balance form.

9 Position personnel to roll the aircraft to roll aircraft on to the scales.

10 Roll aircraft on scales, making sure the wheels are centered on the scales.

11 Level aircraft using spirit level on the top of the tail cone. Add or remove

air from the nose strut to attain level position longitudinally.

12 Spirit level should be placed on the seat rails to check level laterally.

13 Record scale readings and remove the aircraft from scales.

14 Go back to step 8 and repeat the procedure two more times so that three

weights are available for each wheel. Average the weights before entering

them on the weight and balance form.

15 Make practice entries in the sample log book.

16 Return equipment and materials to original point.

17 Check with instructor before going on to the next project.

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8.1 RESULT

SCALE NO. DESCRIPTION RESULTS

1 Main Wheel Landing Gear (Left) 484 lbs

2 Main Wheel Landing Gear (Right) 496 lbs

3 Nose Wheel Landing Gear 224 lbsTOTAL 1,204 lbs

8.2 DISTANCE MEASUREMENT

NO. DATUM DESCRIPTION DISTANCES

1 Datum to centre of Nose Wheel Landing Gear 35.00 inches

2 Datum to centre of Main Wheel Landing Gear(Left) 93.00 inches

3 Datum to centre of Nose Wheel Landing Gear (Right) 93.00 inches

8.3 CENTER OF GRAVITY

Center of Gravity (CG) = Total Moment

Total weigth

= Wnose(Xnose)+ WMR(XMR)+ WML(XML)

Wnose+ WMR+ WML

= 224(35.00)+ 496(93.00)+ 484(93.00)

224+ 496+ 484

= 82.21 inches

9.0 CONCLUSION

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The aircraft of Cessna 152 is airworthiness. It is safe to fly with the centre of

gravity is in the center of gravity range accordingly to the TCDS. And we have found that

the Center Of Gravity (CG) of that Aircraft is 82.21 inches.

10.0 REFERENCE

a) Maintenance manual

b) Type Certificate Data Sheet(TCDS)

c) Civil Aircraft Inspection Procedures(CAIP)

d) Jeppesen General Textbook

e) Instructor leaflet

f) www.faa.gov

http://www.faa.gov/http://www.faa.gov/