Removal of the Stand-Alone Passenger Interface and Supply Adapter (StA-PISA)

TASK 23-73-41-000-802-A
Removal of the Stand-Alone Passenger Interface and Supply Adapter (StA-PISA)

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 1M(3 FT)
No specific	AR	CAP - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	STEPLADDER 0.5 M (1.6 FT)
No specific	1	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
121AL

C. Referenced Information

REFERENCE	DESIGNATION
TASK 33-27-00-00	LIGHT - WORK, CABIN ATTENDANT - DESCRIPTION AND OPERATION

3. Job Set-up
Subtask 23-73-41-010-050-A ** ON A/C NOT FOR ALL

A. Get Access
(1) Put the ACCESS PLATFORM 1M(3 FT) in position at the access door 121AL.
(2) Open the access door 121AL.
(3) Put the STEPLADDER 0.5 M (1.6 FT) in position below the related StA-PISA.

NOTE: For location of StA-PISA refer to (Ref. AMM D/O 33-27-00-00).

Subtask 23-73-41-941-051-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) Make sure that the external power connector is not connected to the aircraft EXT PWR receptacle.
(2) Put WARNING NOTICE(S) in position on access door 121AL to tell persons not to connect the external power connector to the aircraft EXT PWR receptacle.
(3) In the cockpit, on ELEC panel 35VU, make sure that these pushbutton switches are released:

BAT 1, BAT 2
APU GEN
GEN 1, GEN 2
EXT PWR.

(4) In the cockpit, put WARNING NOTICE(S) in position to tell persons not to operate the pushbutton switches on these overhead panels:

21VU (EMER ELEC PWR section)
25VU (APU section)
35VU (ELEC).

Subtask 23-73-41-865-064-A ** ON A/C NOT FOR ALL

C. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	COM/CIDS/DIR ESS/2	157RH	G02
** ON A/C NOT FOR ALL
49VU	COM/CIDS/DIR ESS/1	150RH	G01
** ON A/C NOT FOR ALL
49VU	AIR COND/CIDS/SDF/DIR2 ESS	18WH	C06
49VU	AIR COND/CIDS/SDF/DIR1 ESS	15WH	C05
** ON A/C NOT FOR ALL
49VU	COM DIR ESS/2	157RH	G02
** ON A/C NOT FOR ALL
49VU	COM NAV/CIDS/DIR2 ESS	157RH	G02
49VU	COM NAV/CIDS/DIR1 ESS	150RH	G01
** ON A/C NOT FOR ALL
121VU	COM NAV/CIDS/DEU A NORM/R AFT	168RH	M12
121VU	COM NAV/CIDS/DEU A NORM/L AFT	167RH	M11
121VU	COM NAV/CIDS/DEU A NORM/R FWD	164RH	M10
121VU	COM NAV/CIDS/DEU A NORM/L FWD	163RH	M09
121VU	COM NAV/CIDS/DIR NORM/2	156RH	M06
121VU	COM NAV/CIDS/DIR NORM/1	151RH	M05
** ON A/C NOT FOR ALL
121VU	COM NAV/CIDS/DEU A NORM/R FWD	164RH	M11
121VU	COM NAV/CIDS/DEU A NORM/L FWD	163RH	M10
121VU	COM NAV/CIDS/DIR NORM/2	156RH	M07
121VU	COM NAV/CIDS/DIR NORM/1	151RH	M06
** ON A/C NOT FOR ALL
121VU	COM NAV/CIDS/DIR2 NORM	156RH	M06
121VU	COM NAV/CIDS/DIR1 NORM	151RH	M05
** ON A/C NOT FOR ALL
122VU	AIR COND/CIDS/SDF/DIR NORM/2	14WH	T18
122VU	AIR COND/CIDS/SDF/DIR NORM/1	17WH	T17
122VU	ELEC/EXT PWR/LT CLT/NOT IN/USE	6XG	X30
2000VU	LIGHT-ATTND-WORK	1LZ	J03

4. Procedure
Subtask 23-73-41-020-054-A ** ON A/C NOT FOR ALL

A. Removal of the Stand Alone Passenger Interface and Supply Adapter (StA-PISA)
(1) Do the subsequent steps to open the related circuit breaker panel:

WARNING: BE VERY CAREFUL WHEN YOU DO WORK ON CIRCUIT BREAKER PANELS. THERE IS A HIGH VOLTAGE BEHIND THESE PANELS.

(a) Release the quick-release fasteners and lower the related circuit breaker panel carefully. The circuit breaker panel is held to the adjacent center ceiling panel by a detent hook.
(b) Release the detent hook and lower one side of the related circuit breaker panel until it hangs in the vertical position.
(2) Do the subsequent steps to remove the StA-PISA:
(a) Identify the electrical connectors (6), (7) and (8) and make a note of their position before you disconnect them.
(b) Release the related spring latches (4),(5) and (9) and carefully disconnect three electrical connectors (6), (7) and (8) from the StA-PISA (1).
(c) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(d) Make a note of the position of the StA-PISA (1) before you remove it.
(e) Make a note of the position of the cable clips which keep the related cable loom in position.
(f) Hold the StA-PISA (1) and remove the screws (2), the washers (3) and the related cable clips.
(g) Remove the StA-PISA (1).
(h) If you do not install a new StA-PISA directly after the removal, make sure you close the related circuit breaker panel before you leave the A/C.

Subtask 23-73-41-020-054-B ** ON A/C NOT FOR ALL

A. Removal of the Stand Alone Passenger Interface and Supply Adapter (StA-PISA)
(1) Do the subsequent steps to open the related circuit breaker panel:

WARNING: BE VERY CAREFUL WHEN YOU DO WORK ON CIRCUIT BREAKER PANELS. THERE IS A HIGH VOLTAGE BEHIND THESE PANELS.

(a) Release the quick-release fasteners and lower the related circuit breaker panel carefully. The circuit breaker panel is held to the adjacent center ceiling panel by a detent hook.
(b) Release the detent hook and lower one side of the related circuit breaker panel until it hangs in the vertical position.
(2) Do the subsequent steps to remove the StA-PISA:
(a) Identify the electrical connectors (6) and (7) and make a note of their position before you disconnect them.
(b) Release the related spring latches (4) and (5) and carefully disconnect two electrical connectors (6) and (7) from the StA-PISA (1).
(c) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(d) Make a note of the position of the StA-PISA (1) before you remove it.
(e) Make a note of the position of the cable clips which keep the related cable loom in position.
(f) Hold the StA-PISA (1) and remove the screws (2), the washers (3) and the related cable clips.
(g) Remove the StA-PISA (1).
(h) If you do not install a new StA-PISA directly after the removal, make sure you close the related circuit breaker panel before you leave the A/C.

[Rev.10 from 2021] 2026.03.31 23:18:33 UTC