Page 1 of 2

EFFECTIVITY: 001999

1.. Materials

Not applicable

2.. Special Tools and Equipment

3.. Standard Tools and Equipment

Not applicable

4.. Consumable Materials

Not applicable

5.. Expendable Parts

Not applicable

6.. Referenced Procedures

7.. Procedure

Fokker 50/60 AMM 0050

Cust: St. Airworth. Flying Assets - A/C Conversions

Printed on: Dec 20/11 19:46

Issue Date: Aug 01/07

TASK 21-33-02-720-815-A - Functional Check of Cabin Altitude Pressure Switch (Refer to

MPD 213300-00-01)

1811HR163 Set, Pitot/static system test 1

F50-612M Set, Pitot Static System Adepter 1

24-00-00

SUBTASK 21-33-02-001-015-A00

A. Make sure the electrical power is available (Refer to 24-00-00, Pageblock 201) .

SUBTASK 21-33-02-001-025-A00

B. Remove the access panel 221CZ.

SUBTASK 21-33-02-001-035-A00

C. Use the pitot/static system test set (tool No. 1811HR163) and theswitch hose () (tool No. F28-6281) part of pitot static system adapter

set (tool No. F50-612M)to do the functional check.

SUBTASK 21-33-02-001-045-A00

D. Connect theswitch hose () (tool No. F28-6281) part of pitot static system adapter set (tool No. F50-612M)to the open port of the

pressure switch.

SUBTASK 21-33-02-001-055-A00

E. Make sure the ALERT SYS pushswitch on the central annunciator panel is pushed (out) and the FAULT and BACKUP legends are off.

SUBTASK 21-33-02-001-065-A00

F. Do a functional check of the cabin altitude pressure switch

Action Result

(1.) Slowly apply a suction to the pressure switch until the level

3 warning comes on.

(a) The level 3 warning comes on between 9 200 ft and 10

800 ft altitude reading on the test-set.

(2.) Slowly remove the suction from the pressure switch. (a) The level 3 warning stops.

SUBTASK 21-33-02-001-075-A00

G. Disconnect the test equipment from the pressure switch.

SUBTASK 21-33-02-001-085-A00

H. Remove all tools, materials and equipment from the work area. Make sure the area is clean.
Page 2 of 2

EFFECTIVITY: 001999

Fokker 50/60 AMM 0050

Cust: St. Airworth. Flying Assets - A/C Conversions

Printed on: Dec 20/11 19:46

Issue Date: Aug 01/07

TASK 21-33-02-720-815-A - Functional Check of Cabin Altitude Pressure Switch (Refer to

MPD 213300-00-01)

SUBTASK 21-33-02-001-095-A00

J. Install the access panel 221CZ.

SUBTASK 21-33-02-001-105-A00

K. Remove the electrical power (Refer to 24-00-00, Pageblock 201) .
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