7 5 7 6 passenger arrives wait for row call proper

7-5

7-6
Passenger
Arrives
Wait for row
call
Proper
Boarding
Pass
Directed to
Appropriate
Gate
Oversize
Carry-on
Check
Luggage
Passenger
Boards Aircraft
Yes
Yes
No
No

7.2 Mortgage Service Process Revisited (now CT=60 min. for Title Search)
(a) The bottleneck operation remains “Property Survey” with CT= 90 min. and thus system capacity of (60
minutes/hour)(1/90 minutes) = 2/3 applications per hour as before.
(b) Rush order flow time follows the new critical path, Credit Report, Title Search, and Final Approval for a
sum of 120 minutes.
(c) If the same person performs both Credit Report and Title Search, then the combined CT= 105 min. This
person now becomes the bottleneck and the system capacity is (60 minutes/hour)(1/105 minutes) = 0.57
applications per hour.
7.3 Automobile Driver’s License Office Revisited
Question Figure Total Labor Content
(Seconds)
Process CT
(Seconds)
No. Workers Direct Labor
Utilization (%)
a 9.4a 195 60 6 54
b 9.4b 195 30 7 93
c 9.5 195 30 7 93
(d) Adding one worker and reallocating the tasks has almost doubled the labor utilization.
7.4 (a) Automobile Driver’s License Office Revisited
1 2 3
4 5
15
30
40
20
30
6
120 240 120 120
30
90
180
Bottleneck activity is Activity 4, Conduct Eye Test
Maximum capacity is 90 customers/hour
7-7
Property Survey
CT= 90 min.
Credit Report
CT= 45 min.
Title Search
CT= 60 min.
Mortgage
Applications
Completed
Applications
Final Approval
CT= 15 min.
No
Yes

(b)
30
6
120
3
120
30
2
30
120
1,4,5
75
48
1,4,5
75
48
1,4,5
75
48
The bottleneck is shared by Activities 2, 3, and 6, and has a capacity of 120 customers/hour.
This solution will require 3 cameras and 3 eye testing machines, because the first stage has 3 workers in
parallel doing identical jobs that consist of 3 activities (1, 4, and 5).
7.5 (a) Physical Examination
1
10
6
2
3
20
3
3.3
18
4
6
10
5
12
5
Nurse Nurse Physician Nurse Physician
Bottleneck activity is Activity 2, Medical History
Maximum capacity is 3 patients/hour
(b)
3&5
2
3&5
2
1
10
6
2
2
30
30
30
30
2&4
2&4
Improved layout : New capacity is 4 patients/hour
7-8

2
3
20
3&5
2
1 & 4
3.75
16
3&5
2
30
30
Self Service
1 & 4
3.75
16
Capacity is 4 patients/hour, provided we have a queue of patients, because for this arrangement, Activity
2, Medical History, is self-service and, also, only two nurses are required.
Best layout
New capacity is 4 patients/hour
Note: For this arrangement, Activity 2, Medical History, can be self-service.
7.6 (a) School Cafeteria
1
2 3
4 5
10
120 360
30
60
60
180
20
90
40
Bottleneck is Activity 3, Serve entree.
Maximum capacity is 60 people/hour.
(b)
1&2
90
40
3&4
3&4
45
45
80
80
5
90
40
Capacity is increased to 90 people per hour and requires only 4 servers.
(c) Make Activity 1, Serve salad and dessert, and Activity 2, Pour drinks, self-serve.
7.7 (a) Flu Vaccine Shots
120
30
60
60
1
2
3 4
45
80
90
40
7-9

Bottleneck is Activity 4, Administer vaccination.
Maximum capacity is 40 people/hour.
(b)
1
2 3
4a
4b
30
120
60
60
45
80
90
40
90
40
Bottleneck is Activity 2, Drug allergy consultation.
Maximum capacity is 60 people/hour.
(c)
3
4a
4b
45
80
90
40
90
40
90
90
40
40
1&2
1&2
All activities are perfectly balanced with capacity is 80 people/hour.
7.8 (a) Ocean World Theme Park Revisited
A
C
B
D
F
E
7-10