Index

CHAPTER 8

LAUNCH SITE OPERATION

Launch Site Operation mainly includes:

The typical working flow and requirements of the launch site operation are introduced in this chapter. For different launch missions, the launch site operation will be different, especially for combined operations related to joint efforts from SC and LV sides. Therefore, the combined operations could be performed only if the operation procedures are coordinated and approved by all sides.

LM-2C uses JSLC as its main launch site. The launch site operations in JSLC are focused in this Chapter. The operations in XSLC are similar.

8.1 LV Checkouts and Processing

Two-stage LM-2C or LM-2C/CTS launch vehicle is transported from CALT facility (Beijing, China) to JSLC (Gansu Province, China) and undergoes various checkouts and processing in the North Technical Center and the South Launch Center. The typical LV working flow in the launch site is shown in Table 8-1.

Table 8-1 LV Working Flow in Launch Site

 

No.

Item

Working Period

Accumulative Period

T

E

C

H

.

1

To Unload LV from the Train and Transfer LV to LV Test Building (BL).

1 day

1 day

2

Unit Tests of Electrical System

7 days

8 days

3

LV Status Recovery before Transfer

3 days

11 days

       
         

L

A

U

N

C

H

C

E

N

T

E

R

4

To Transfer LV to the Launch Center and Erect LV on the Launch Tower

1 days

12 days

5

Tests to Separate Subsystems

2 days

14 days

6

Matching Test Among Subsystems

2 days

16 days

7

overall checkout on the first and second stages

2 days

18 days

8

To Mate SC/Fairing Stack with LV

1 days

19 days

9

CTS subsystem tests and matching tests

1 days

20 days

10

The First Overall Checkout

1 day

21 days

11

The Second Overall Checkout ( Launch Rehearsal, SC Involved)

1 day

22 days

12

The Third Overall Checkout

1 day

23 days

13

Reviews on Checkout Results

1 days

24 days

14

Functional Check before Fueling, Gas Replacement of Tanks

1 days

25 days

15

N2O4/UDMH Fueling and Launch

2 day

27 days

       

Total

 

27 days

27 days

After SC is transferred to Launch Center, some of SC and LV operations can be performed in parallel under conditions of no interference.

8.2 Combined Operation Procedures

Take LM-2C/CTS launching multiple SCs as an example.

8.2.1 SC/LV Integration and Fairing Encapsulation in North Technical Center

In BS2 & BS3, SC team carries out all the SC operations. LV side is responsible for mating SCs with CTS and installing SC/LV separation devices. The following describes the typical working procedure:

  1. In BS3, CALT to clean up the fairing halves and install wires and sensors on the inner surface of the fairing, and glue the thermal blanket (cork panel) on the outer surface of the fairing; SC side to prepare and perform SC testing;

  1. In the assembly area of BS3, CALT to install the solid rocket motor on the CTS; CALT to move the CTS to the fueling area, to fuel RCS with hydrazine and perform gas-filling for the gas bottles; CALT to move the CTS back to the assembly area;
  2. CALT to bolt the CTS with the supporting table through the LV Adapter;
  3. SC side to hoist the fueled & weighed SCs overhead the CTS; CALT to mate SCs with CTS one by one;
  4. CALT to encapsulate the fairing;
  5. CALT to install explosive bolts on the fairing, and finally form a SC/Fairing stack;
  6. Refer to Figure 8-1.

    8.2.2 SC Transfer and Fairing/Stage-2 Integration

    CLTC is responsible for transferring the encapsulated fairing from BS3 to the North Launch Center. The following working procedures are performed:

  7. CLTC to load the SC/Fairing stack onto the transfer trailer; CLTC to connect the transfer trailer with the tractor, and make the air-conditioning pipe connected to the encapsulated fairing, then get the temperature and humidity monitoring system ready; CLTC to transfer the SC/Fairing stack to the Launch Center;
  8. CLTC to move the encapsulated fairing stack under the launch tower, and install hoisting sling;
  9. CLTC to lift up the encapsulated fairing stack onto the stage-2 of LM-2C, which is already erected;
  10. CALT to mate the encapsulated fairing with stage-2 of LM-2C;
  11. Refer to Figure 8-2.

  12. CALT to set up an air-conditioned closure for the SC/Fairing stack, and connect the air-conditioning pipes to the encapsulated fairing air-conditioned, then record the environment parameters inside the fairing;
  13. CALT to connect the umbilical cable, SC side to monitor SC status and charge SC battery;
  14. CALT to perform subsystem tests and matching test for CTS, SC side to perform SC testing;
  15. CALT and SC side to conduct launch rehearsal (SC involved). This is the end of combined operations.

8.3 SC Preparation and Checkouts

8.4 Launch Limitation

8.4.1 Weather Limitation

8.4.2 "GO" Criteria for Launch

8.5 Pre-launch Countdown Procedure

The typical pre-launch countdown procedure in the launch day is listed below:

No.

Time

Event

1

-7 hours

Launch Status Preparation;

2

-5 hours

LV Power-on, Functional Checkouts on Each Sub-system

3

-4 hours

Connecting Plugs for Battery and Pyrotechnics

4

-3 hours

LV Status Checkouts, Sealing;

5

-2 hours

GSE Status Checkouts;

6

-90 minutes

Final Launch Status Preparation;

7

-60 minutes

SC side send "GO" signal; Battery air-conditioning stops; LV tanks are pressurized; Aiming;

8

-40 minutes

Flight Software Loading;

One of Air-conditioning Pipes Drop-off;

9

-30 minutes

Moveable Platforms on the Umbilical Tower Withdrawal;

10

-15 minutes

Umbilical Disconnection;

11

-7 minutes

The Final Air-conditioning Pipe Drop-off;

12

-2 minutes

LV Power Switch Over, In-Flight-Disconnectors (IFD) Drop-off;

13

-1 minute

Swinging Arms Withdrawal;

14

-40 seconds

TT&C Systems Starting;

15

-5 seconds

Camera On

16

0

Ignition

8.6 Post-launch Activities

The orbital parameters of the injected orbit will be provided to Customer in half-hours after SC injection.

The launch evaluation report will be provided to the Customer in a month after launch.