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Compass swing notes from Collins avionics

 

 

Rockwell Collins Compass Swing Demonstration for the AHS-85 and MCS-65 Systems

Course Summary

This course demonstrates some different compass swing techniques that can be used to align either the MCS-65 system or the AHS-85 system.

Content Topics

  1. Checking the Compass Site

      1. Visual Check

        1. 300 feet from other aircraft

        2. 600 feet from all large visible magnetic objects

        3. Not close to fuel tanks, power lines, buildings, light poles, railroad tracks, or underground fuel lines or tanks

        4. Check for underground power cables, reinforcement rods, and natural magnetic changes

      2. Marking the Site

        1. Find center and mark

        2. Center tripod and level over mark

        3. Align north mark to magnetic pointer

        4. Mark a spot 125 feet north from center

        5. Mark other cardinal points 125 feet from center

      3. Checking the Site Marks

        1. Move transit to north mark, center and relevel compass

        2. Place rod on east point and measure angle from north

        3. Should be 135 degrees to east mark, 180 degrees to south and 225 degreesto west

        4. Repeat from all cardinal points

        5. From east, north should be 315 degrees, west – 270 degrees, and south – 225 degrees

        6. From south, east – 45 degrees, west – 315 degrees, north – 0 degrees

        7. Alternate method – ramp squares

  1. System Components

      1. Compass Basics

        1. Components

          1. Combined gyro and electronics unit

          2. Flux detector

          3. Compensation units

        2. Global compass operation

        3. Flux detector operation

        4. Magnetic effects of aircraft

        5. Correcting errors using compass card

        6. Compensation units

          1. RCP-65

          2. CCU-65

          3. ICU-85

  1. Review Basics

      1. Sine compensation control

      2. Cosine compensation control

      3. Index compensation control

  1. Compass Swing Using Voltage Method

      1. Aircraft positioned accurately

        1. North heading

        2. Set sin voltage at test point 1 to 0 V, test point 2 for cosine compensation, and test point 6 for the index compensation to 0 V.

      2. Set-up mode

        1. Connect meter to test point 3

        2. Record voltage 4 seconds after it comes on

      3. Use the correct meter

        1. Fluke 8062

          1. Three decimal places after voltage readings

          2. Good sampling rate

        2. Fluke 87

          1. Three decimal places

          2. Analog voltage scale

          3. Hold mode

        3. Windspeed

          1. Less than 15 knots

      4. Read 8 voltages

      5. Computer calculations

        1. Minimum system requirements

        2. Installation

        3. Order program disk from Collins order admin. in Melbourne, FL

        4. Data entry

        5. Setting compensation/index controls

      6. Calculations by hand

      7. Position error method

      8. Computer calculations

      9. Hand calculations

      10. Summary

 

 

King air

 

1. Fwd Rh FSB inop, check bulbs.

2. Aft FSB/NS at left bulkhead inop, there is no connector accessible at the aft bulkhead location.

3. 2 cabin window eschusion wire harness are trapped behind window line, connector not accessible.

4. 2 switches fwd left galley inop. not labeled

5. Toilet timer inop? toilet flush motor only runs when button is held down.  Check for delay relay.

6. Aft Rh pylon, 2nd from bottom shelf release broken

 

OVERLAYS

 

101-364? FIREWALL SO VALVE

Clean overlay using plastic cleaner.

Touch up light spills with SemiFlat blac paint, and or Sharpie.

 

est bulbs

Ops test good.

 

101320-299. COPILOT AIR

Clean overlay using plastic cleaner.

Touch up light spills with SemiFlat blac paint, and or Sharpie.

est bulbs

Ops test good

101-32046 DEFROST AIR

Clean overlay using plastic cleaner.

Touch up light spills with SemiFlat blac paint, and or Sharpie.

Test bulbs.  Fould 1 14 volt bulb installed, replaced with new D158-100-5.

Two bulbs inop.  Replace with new.

Noted power connector intermitant.  Boken solder at center conductor.  Resoldered.

 

Ops test good

101-525312-1. ELEVATOR TAB

Clean overlay using plastic cleaner.

Touch up light spills with SemiFlat blac paint, and or Sharpie.

Test bulbs.  4 14 volt bulbs installed.  3 failed bulbs. Replace with new.

Ops test good

101 320252-1. AVIONICS MASTER

 

Clean overlay using plastic cleaner.

Touch up light spills with SemiFlat blac paint, and or Sharpie.

Test bulbs.  2 14 volt bulbs installed.  2 failed bulbs. Replace with new.

Ops test good

PM ? 3 21/4 GAGES

 

Clean overlay using plastic cleaner.

Touch up light spills with SemiFlat blac paint, and or Sharpie.

Test bulbs.  114 volt bulbs installed.  1  failed bulbs. Replace with new.

Ops test good

 

 

 

 

 

 

 

 

 

 

 

 

Heffley house air conditioning

 

 

Manual for the oitside unit.

ToddAC.

Large difference in the shape of the curves after cleaning the filters.  Right side of the screen is running filters removed.

 

http://192.168.2.115:8888/statistics.html?activePage=2

July 22 2023, typical 103 degree day, no filters installed.

 

Filters

29×10.   19.5×19.5

 

 

 

 

 

 

 

MGTL AVIATION work order

 

 

Look in AIRCRAFT

Fixed duplicate pages

Fixed page numbers

Item # is page number

Descrepancy 1 starts a new SECTION in google docs. That causes ITEM # to match PAGE # in descrepancy section.

To add new descrepancy,  go to last item. Highlight. <CNTRL> C.     Postion cursor at the end.   <CNTRL> ENTER.

 

TO updat TABLE OF CONTENTS.  delete it.

 

Refresh table of contents daily

 

 

Shft ctl v. Will paste stripped text.