(7)
 Make sure that the other loads connected to the emergency power-supply unit operate.

 (8)
 On the overhead panel 25VU, set the EMER EXIT LT switch 4WL to the OFF position.

R 1EFF : 001-049, 051-099, 101-149, 151-199, 1 33-51-38Page 424 1201-299, 401-499, 1Aug 01/05 1 1 1CES 1

R  **ON A/C 301-399, 
R  Subtask 33-51-38-860-054-A 
R  B. Aircraft Maintenance Configuration 
R  (1) Make sure that the stepladder is in position: 
R  FOR 10WL 
R  at the left FWD passenger/crew door, 
R  FOR 11WL 
R  between the rear emergency exit doors, 
R  FOR 12WL 
R  between the rear emergency exit doors, 
R  FOR 13WL 
R  between the AFT passenger/crew doors, 
R  FOR 14WL 
R  between the forward emergency exit doors, 
R  FOR 15WL 
R  between the forward emergency exit doors. 
R  (2) Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-
R  002). 
R  (3) On the overhead panel 25VU, make sure that the NO SMOKING switch 
R  190RH is in the OFF position. 
R  (4) On the Forward Attendant Panel (FAP) 120RH, make sure that the LIGHT 
R  EMER pushbutton switch and its integral light are off. 
R  (5) On the overhead panel 25VU, set the EMER EXIT LT switch 4WL to the ON 
R  position. 
R  (6) Make sure that the loads connected to the emergency power-supply unit 
R  operate. 
R  (7) On the overhead panel 25VU, set the EMER EXIT LT switch 4WL to the 
R  OFF position.

 **ON A/C ALL
 4. Procedure
_________

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 (Ref. Fig. 401/TASK 33-51-38-991-001-A)
 **ON A/C 301-399,
 (Ref. Fig. 401A/TASK 33-51-38-991-001-B)

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 Subtask 33-51-38-420-052
 A. Installation of the Battery of the Emergency Power-Suppy Unit
 NOTE : Make sure that the contacts between the battery and the emergency
____ power supply unit are clean and in good condition.
 (1) Carefully install the battery (6) to the emergency power-supply unit
 (1) with the screws (5) and tighten.
 NOTE : Make sure that the battery is fully charged before you install
____ it to the emergency power-supply unit (Ref. CMM 335107).
 NOTE : To measure and keep the load values, the load programming
____ (TEACH IN) of the EPSU starts automatically when:
 -
the AC and the DC power are available, - on the FAP 120RH the LIGHT EMER pushbutton switch and its integral light are off, - on the overhead panel 25VU the EMER EXIT LT switch 4WL is in the OFF position,

 - on the overhead panel 25VU the NO SMOKING switch 190RH is in the OFF position,

 -
the overwing emergency lights are off,

 -
the emergency power-supply unit is installed on the A/C for the first time, or the battery was removed for more than 5 s and is then installed again.

R  **ON A/C 301-399, 
R  Subtask 33-51-38-420-052-A 
R  A. Installation of the Battery of the Emergency Power-Suppy Unit 
R  NOTE : Make sure that the contacts between the battery and the emergency____ 
R  power supply unit are clean and in good condition. 
R  (1) Carefully install the battery (6) to the emergency power-supply unit 
R  (1) with the screws (5) and tighten. 
R  NOTE : Make sure that the battery is fully charged before you install____ 
R  it to the emergency power-supply unit (Ref. CMM 335107). 
R  NOTE : To measure and keep the load values, the load programming____ 
R  (TEACH IN) of the 
R  EPSU starts automatically when: 
R  - the AC and the DC power are available, 
R  - on the FAP 120RH the LIGHT EMER pushbutton switch and its 
R  integral light are off, 
R  - on the overhead panel 25VU the EMER EXIT LT switch 4WL is in 
R  the OFF position, 
R  - on the overhead panel 25VU the NO SMOKING switch 190RH is in 
R  the OFF position, 
R  - the emergency power-supply unit is installed on the A/C for 
R  the first time, or 
　
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