IRS Malfunction Codes
Figure 102 (Sheet 2)
H55237
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITHOUT EFIS ú
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A 737-300/400/500MAINTENANCE MANUAL
1. DETERMINE IRS RADIAL POSITION ERROR
NOTE:____ 1. TO ACCOMPLISH THE FOLLOWING STEPS, EACH IRS MODE SELECT SWITCH MUST REMAIN IN THE NAV POSITION AT FLIGHT TERMINATION. THIS IS TO PRESERVE THE IRS POSITION COORDINATES COMPUTED DURING FLIGHT. THESE COORDINATES ARE DISPLAYED ON THE POS REF 2/2 PAGE.
2. IN THE FOLLOWING STEPS AIRPLANE PRESENT POSITION AND IRS POSITION ARE ENTERED INTO THE FMCS ACT RTE LEGS 1/3 PAGE. WHEN ENTERED, THESE POSITIONS ARE DISPLAYED AS WAYPOINTS.
A. PRESS FMCS CDU LEGS KEY. OBSERVE ACT RTE LEGS 1/3 PAGE IS DISPLAYED.
B. DELETE ALL WAYPOINTS FROM ACT RTE LEGS 1/3 PAGE.
C. ENTER AIRPLANE PRESENT POSITION COORDINATES INTO DATA FIELD OF ACT RTE LEGS 1/3 PAGE.
D. PRESS CDU INIT REF KEY, THEN PRESS NEXT PAGE KEY. OBSERVE POS REF 2/2 PAGE IS DISPLAYED.
E. TRANSFER IRS L POSITION COORDINATES, FROM POS REF 2/2 PAGE INTO THE DATA FIELD OF ACT RTE LEGS 1/3 PAGE.
F. DISTANCE BETWEEN COORDINATES IS DISPLAYED IN NAUTICAL MILES, ON ACT RTE LEGS 1/3 PAGE. NOTE THE DISTANCE. THE DISTANCE REPRESENTS RADIAL POSITION ERROR BETWEEN AIRPLANE PRESENT POSITION AND IRS L POSITION.
G. DELETE IRS L POSITION FROM ACT RTE LEGS 1/3 PAGE.
H. TRANSFER IRS R POSITION COORDINATES, FROM POS REF 2/2 PAGE INTO THE DATA FIELD OF ACT RTE LEGS 1/3 PAGE.
I. DISTANCE BETWEEN COORDINATES IS DISPLAYED IN NAUTICAL MILES, ON ACT RTE LEGS 1/3 PAGE. NOTE THE DISTANCE. THE DISTANCE REPRESENTS RADIAL POSITION ERROR BETWEEN AIRPLANE PRESENT POSITION AND IRS R POSITION.
2.
REFER TO RADIAL POSITION ERROR CHART BELOW. AS A FUNCTION OF HOURS IN NAV MODE AND DISTANCES NOTED, DETERMINE IF RADIAL POSITION ERROR IS EXCESSIVE OR WITHIN ACCEPTABLE LIMITS.
3.
THE EQUATION 3+3T MAY ALSO BE USED TO DETERMINE IF RADIAL POSITION ERROR IS EXCESSIVE OR WITHIN ACCEPTABLE LIMITS. T IS HOURS IN NAV MODE. DISTANCE ON ACT RTE LEGS 1/3 PAGE IS ACCEPTABLE IF LESS THAN 3+3T NAUTICAL MILES.
RADIAL POSITION ERROR CHART 12 11
HOURS IN NAV MODE
10
9
8
7
6 5 4
3 2 1
DISTANCE (NAUTICAL MILES)
IRS Accuracy Criteria Figure 103
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A
737-300/400/500MAINTENANCE MANUAL
INERTIAL REFERENCE SYSTEM - MAINTENANCE PRACTICES
_________________________________________________
1. General_______
A. This procedure contains one task. That task is the alignment of the inertial reference system (IRS).
B. There are two types of alignments: regular and high latitude.
C. Regular alignment is from latitude 70.2 degrees south to latitude 70.2 degrees north. A regular alignment takes 10 minutes.
D. High latitude alignment is from latitude 70.2 degrees north to latitude
78.2 degrees north and from latitude 70.2 degrees south to latitude 78.2 degrees south. A high latitude alignment takes 17 minutes.
E. Above 78.2 degrees north latitude and below 78.2 degrees south latitude you can not accurately align the IRS.
F. You can align the IRS from any flight management computer (FMC) control display unit (CDU) or the inertial system display unit (ISDU).
G. You can not move the airplane while you align the IRS.
H. The local latitude and longitude are necessary to align the IRS.
TASK 34-28-00-822-015
2. Alignment Of The IRS____________________
A. References
(1)
AMM 21-58-00/501, Equipment Cooling
(2)
AMM 24-22-00/201, Manual Control
B. Access
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：737-300 400 500 AMM 飞机维护手册 导航 NAVIGATION 2(37)
