R  Subtask 33-51-12-860-051 
R  B. Aircraft Maintenance Configuration 
R  (1) Make sure that the EMER EXIT LT switch 4WL on the overhead panel 25VU 
R  is in the OFF position. 
R  (2) Make sure that the LIGHT EMER pushbutton switch and its integral 
R  light on the forward attendant panel 120RH are off. 
R  4. Procedure_________ 
R  (Ref. Fig. 402/TASK 33-51-12-991-003) 
R  Subtask 33-51-12-020-053 
R  A. Removal of the Marking Light of the Floor-Proximity Emergency-Escape Path 
R  (1) Removal of the Light Module 
R  (a) Release the attachment clip (5) and lift the module housing (6) 
R  from the top track (4). 
R  (b) Hold the module housing (6) and pull the lampholder (3) out of 
R  the module housing (6). 
R  (c) Remove the module housing (6). 
R  (2) Removal of the Bulb of the Light Module 
R  (a) Release the attachment clip (5) and lift the module housing (6) 
R  from the top track (4). 
R  (b) Hold the module housing (6) and pull the lampholder (3) out of 
R  the module housing (6). 
R  (c) Remove the module housing (6). 
R  (d) Remove the bulb (1).

R Floor-Proximity Emergency-Escape Path-Marking Light R Figure 402/TASK 33-51-12-991-003
 1EFF : 051-099, 1 33-51-12Page 414 1 1 May 01/05 1 1 1CES 1

R  TASK 33-51-12-400-002 
R  Installation of the Marking Light of the Floor-Proximity Emergency-Escape Path 
R  (BRUCE) 
R  WARNING : MAKE SURE THAT ALL THE CIRCUITS IN MAINTENANCE ARE ISOLATED BEFORE_______ 
R  YOU SUPPLY ELECTRICAL POWER TO THE AIRCRAFT. 
R  1. Reason for the Job__________________ 
R  Self Explanatory 
R  2. Job Set-up Information______________________ 
R  A. Fixtures, Tools, Test and Support Equipment 
R  -------------------------------------------------------------------------------
R  REFERENCE  QTY DESIGNATION 
R  -------------------------------------------------------------------------------
R  No specific  lint free cloth 
R  B. Referenced Information 
R  -------------------------------------------------------------------------------
R  REFERENCE  DESIGNATION 
R  -------------------------------------------------------------------------------
R  33-51-00-710-002  Operational Test of Emergency Escape-Path 
R  Marking-Lights 
R  33-51-12-991-003  Fig. 402 
R  3. Job Set-up__________ 
R  Subtask 33-51-12-860-055 
R  A. Aircraft Maintenance Configuration 
R  (1) Make sure that the EMER EXIT LT switch 4WL on the overhead panel 25VU 
R  is in the OFF position. 
R  (2) Make sure that the LIGHT EMER pushbutton switch and its integral 
R  light on the forward attendant panel 120RH are off.

R  Subtask 33-51-12-865-055 
R  B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and 
R  tagged 
R  -------------------------------------------------------------------------------
R  PANEL DESIGNATION IDENT. LOCATION 
R  -------------------------------------------------------------------------------
R  49VU LIGHTING/EMER LT/CABIN 2WL H06 
R  49VU LIGHTING/EMER LT/CABIN 1WL H05 
R  4. Procedure_________ 
R  (Ref. Fig. 402/TASK 33-51-12-991-003) 
R  Subtask 33-51-12-910-051 
R  A. Preparation for Installation 
R  (1) Make sure that the parts retained from the removed component are 
R  clean and in the correct condition. 
R  (2) Clean the component interface and/or the adjacent area with a lint 
R  free cloth. 
R  (3) Do an inspection of the component interface and/or the adjacent area. 
R  Subtask 33-51-12-420-054 
R  B. Installation of the Marking Light of the Floor-Proximity Emergency-Escape 
R  Path 
R  (1) Installation of the Light Module 
R  (a) Push the lampholder (3) into the module housing (6). 
R  (b) Install the module housing (6) in the top track (4). 
R  Make sure that you hear a click when the module housing (6) locks 
　
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