Laporan Electricity SystemREVISI

AIRCRAFT MAINTENANCE PRACTICE REPORT

IDENTIFICATION AND INSPECTION OF AIRCRAFT ELECTRICAL

SYSTEM ON GRAND COMMANDER 680 FL(P) AIRCRAFT AND

CONTINENTAL PISTON ENGINE TSIO-520E

Created by:

Risky Pratama P. (111221025)RR. Alvina Rana P. (111221026)

Saadilah Rasyid (111221027)Tria Satria (111221028)

Ulfi Latipah O. (111221030)Yusuf Adiwinata (111221031)

Zaskia Azhar Yasmin (111221032)

Kelas 3 Aeronautika

Program Studi Teknik Aeronautika

Jurusan Teknik Mesin

POLITEKNIK NEGERI BANDUNG

1. JOB NUMBER : APJ-001

2. MODUL NUMBER : APM-001

3. JOB TITLE : Aircraft Electrical System Practices

4. JOB DESCRIPTION : Identification and Inspection of Aircraft Electrical System

5. TOOLS & EQUIPMENT :

Screw driver flat

Screw driver Philips

Flash light

Socket 3/8

Open - ring 3/8

Battery 28V DC

Plier

Cutter

Majun

Multimeter (Avometer)

Rachet

Spatula

WD-40

Mallet

Wire Brush

6. REFERENCES :

AMM Grand Commander 680 FL(P)

IPC Grand Commander 680 FL(P)

AMM Engine Continental

7. JOB INSTRUCTION EXECUTION & RESULT :

Job Instruction General:

a. Select the available aircraft in the workshop and collect its available document

to execute the job described above. (we select the Grand Commander Aircraft)

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b. Locate and compile related document to the job request to do ( make a copy is

recommended)

c. Identify the materials, tools and step required to execute the job described

above and stimulate by related manual.

d. Establish the job safety analysis based on the step by step job description that

you have developed

e. Complete the PWT (permit to work) before starting the step by step job

description execution

A. GENERATOR, MAGNETO AND STARTER ON GRAND COMMANDER

1) Localize Generator, Magneto and Starter

The step by step work activities:

a. Reading the AMM Grand Commander

b. Go to the aircraft and find the location

c. Identify the item that we get , is it true or wrong item.

2) Result of job execution

Gambar 1 Left Engine Grand Commander (source: AMM Grand Commander)

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GENERATOR

Gambar 2 Generator

MAGNETO

Gambar 3 Magneto

STARTER

Gambar 4 Stator

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As can be seen in the picture above, Our group has found the location of

generator, magneto and starter on Grand Commander Aircraft accordance

with that specified in AMM.

3) Finding

4) Finding Solution (Troubleshoot)

B. BATTERY

1) Localize of Battery on Grand Commander

The step by step work activities:

a. Reading the AMM Grand Commander

b. Open pressurization equipment access door on the left side of the

aft fuselage

c. Find the battery location

2) Battery Inspection

The step by step work activities:

a. Reading the AMM and IPC Grand Commander

b. Remove battery door catch with first remove the attaching part

(bolt and washer)

c. Place the battery on its position

d. Brush the positive and negative copper in the tip of cable with wire

brush

e. Connect the battery positive pole to the positive cable

f. Connect the battery negative pole to the negative cable

g. Check connectivity of the cable

3) Result of Job Execution

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Gambar 5 Battery Location

Our group has find the location of battery on Grand Commander Aircraft

based on the instructions contained in the AMM, but no battery exist in

that place.

4) Finding

The battery is not exist on Aircraft, not even the battery, the battery tray is

missing from the place too.

The Relay is not functioning/working because we try to connect the

battery and relay there is no contact between them both.

5) Finding Solution (Troubleshoot)

Our group finding the battery tray in the aircraft cabin and we found it,

except the battery tie down, after that our group re-assembly the battery

tray to the origin place.

Gambar 6 Battery Tray

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For the battery, we used the battery 28V DC to replace the aircraft battery

function. We put the external battery in the position above battery tray,

then we connect the battery to the wire on aircraft.

We are concerned that the current does not flow because we did not

exactly put the wires on relay, therefore we try to remove the wire ties that

connected to the relay in order to facilitate the cable will be connected to

the battery, but we found trouble when we try to open the clamp, the clamp

is so hard to opened because of corrosion. We try to opened the clamp

until the time is up, but the clamp still wont to open.

C. EXTERNAL POWER

1) Localize External Power

The step by step work activities:

a. Reading the AMM Grand Commander

b. Go to the aircraft and find the location

c. Identify the item that we get , is it true or wrong item.

2) Result of Job Execution

Gambar 7 External Power Receptacle

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Gambar 8 External Power Receptacle on Aircraft

We found the external power receptacle near the battery position and in

good condition

D. ALTERNATOR ON CONTINENTAL PISTON ENGINE

1) Disassembly Alternator

The step by step work activities:

a) Spray WD-40 to the nut and bolt.

b) Remove attaching parts (washer and nut (3,4,5)) and pull alternator

hub assembly from crankcase as unit. Use spatula to pull the

alternator.

c) Remove cotter pin (13) and pull assembly from alternator shaft,

remove woodruff key.

d) Separate thrust washer (12) ,gear assembly (10), and hub assy (8)

from alternator

e) Don’t forget to store washer, nut, cotter pin in the safe place.

2) Assembly Alternator

The step by step work activities:

a) Re-install thrust washer (12) ,gear assembly (10), and hub assy (8)

to one assembly.

b) Install woodruff to the right place.

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c) Install cotter pin (13), and nut (7) until the gear assembly come

into one piece.

d) Re-install alternator to the engine with mallet to knock it until fit to

the engine.

3) Result of Job Execution

Gambar 9 Alternator Assembly

Gambar 10 Alternator

E. STARTER ON CONTINENTAL PISTON ENGINE

1) Disassembly Starter

The step by step work activities:

a) Remove Attaching part (44,45) and pull starter from adapter studs.

b) Open the inside of starter carefully.

2) Assembly Starter

The step by step work activities:

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a) Install all of the inside starter part. Make sure there is no any part

left behind.

b) Reinstall starter to adapter, and fastened with the attaching part

(44,45)

3) Result of Job Execution

Gambar 11 Starter Assembly

Gambar 12 Starter

8. CONCLUSION

The Electric system on Grand Commander 680 FL(P) that we identified is:

1. Battery, located in the panel side of the aft suselage

2. External Power, located in

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3. Generator, Magneto and Starter located inside engine nacelle attached to the

engine

The Battery is not exist on aircraft, and there is some trouble with the relay.

9. RECOMMENDATION

1. Repair the relay so we can check the other problem until the battery is working

on the aircraft.

2. Provide corrosion removal fluids such as WD-40 so we can open the screw

easier

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