(27)
 Calculate zone 13 smoke sampling port velocity delta (PVD), use the following formula:

 PVD = maximum smoke sampling port velocity - minimum smoke sampling port velocity.
 S 975-333
 (28) Make sure zone 13 smoke sampling port velocity delta (PVD) do not exceed 100 feet per minute.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 S 975-159
 (29) Use a hot wire anemometer and adapter to examine the air velocity at each orifice in zone 14 of the main deck cargo compartment.
 -
STA 1937, RBL 3.0

 -
STA 1961, RBL 5.0

 -
STA 1985, RBL 3.0

 -
STA 2009, RBL 3.0

 -
STA 2033, RBL 5.0

 -
STA 2057, RBL 3.0

 S 975-160
 (30)
 Make sure the air velocity is 150 feet per minute minimum at each orifice.

 S 975-334

 (31)
 Calculate zone 14 smoke sampling port velocity delta (PVD), use the following formula:

 PVD = maximum smoke sampling port velocity - minimum smoke sampling port velocity.
 S 975-335
 (32)
 Make sure zone 14 smoke sampling port velocity delta (PVD) do not exceed 100 feet per minute.

 S 975-161

 (33)
 Use a hot wire anemometer and adapter to examine the air velocity at each orifice in zone 15 of the main deck cargo compartment.

 -
STA 2081, RBL 3.0

 -
STA 2105, RBL 7.0

 -
STA 2129, RBL 3.0

 -
STA 2153, RBL 3.0

 -
STA 2177, RBL 7.0

 -
STA 2201, RBL 3.0

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 975-162
 (34)
 Make sure the air velocity is 150 feet per minute minimum at each orifice.

 S 975-336

 (35)
 Calculate zone 15 smoke sampling port velocity delta (PVD), use the following formula:

 PVD = maximum smoke sampling port velocity - minimum smoke sampling port velocity.
 S 975-337
 (36)
 Make sure zone 15 smoke sampling port velocity delta (PVD) do not exceed 100 feet per minute.

 S 975-163

 (37)
 Use a hot wire anemometer and adapter to examine the air velocity at each orifice in zone 16 of the main deck cargo compartment.

 -
STA 2225, RBL 3.0

 -
STA 2249, RBL 5.0

 -
STA 2273, RBL 3.0

 -
STA 2297, RBL 3.0

 -
STA 2321, RBL 5.0

 -
STA 2345, RBL 3.0

 S 975-164
 (38)
 Make sure the air velocity is 150 feet per minute minimum at each orifice.

 S 975-338

 (39)
 Make sure zone 16 smoke sampling port velocity delta (PVD) do not exceed 100 feet per minute.

 S 975-339

 (40)
 Calculate zone 16 smoke sampling port velocity delta (PVD), use the following formula:

 PVD = maximum smoke sampling port velocity - minimum smoke sampling port velocity.
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 ALL  ú ú 08 Page 528 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 975-343
 (41)
 Make sure zone 16 smoke sampling port velocity delta (PVD) do not exceed 100 feet per minute.

 S 865-179

 (42)
 Remove the pressure from the pneumatic crossover duct (AMM 36-00-00/201).

 S 435-067

 (43)
　
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