| Shifting of electrical substation; permission for demolition of link building. These were critical pieces of operational infrastructure located in Zone 1 of the proposed Integrated Terminal Building. | Anchor: land encumbrance;category: site constraint | Link building area was handed over on April 1, 2011, about 29 months after commencement of construction. | 1 |
| Shifting of line maintenance building and motor transport workshop and permission for demolition. These were operational facilities located in Zones 3 and 4 of the proposed Integrated Terminal Building | Anchor: land encumbrance;category: site constraint | Line maintenance building area was handed over on October 20, 2009, about 1 year after commencement of construction. | 2 |
| Service area, its building, and the underground sewerage treatment plant were not defined in the initial plan drawings. | Anchor: land encumbrance;category: site constraint | The locations were finalized 1 year after commencement of construction. | 3 |
| Inclusion of separate architect/design consultant for Domestic and International terminals, with no interface between the consultants, resulted in major disorder when the structure was designed as an integrated terminal. | Anchor: cascading planning deficiency;category: process constraint | Dissimilar architectural concept and design outputs with convergence disagreements between consultants resulted in time loss. This time loss affected the schedule performance but could not be segregated and quantified in the study. | 4 |
- (a)
The AAI had no prior experience of such a large commissioning exercise since its inception in 1994. - (b)
Transition of all operations staff, airlines, passenger, security, health organization, customs and passport control services. Operations from existing terminal buildings were planned to be shut down.
| Anchor: complex, multidisciplinary decision-making environment;category: governance constraint | Any glitch in transition would delay project commissioning. Other high-profile international airports experienced commissioning fiascos. Meticulous planning and rigorous trails ensured smooth transition, and hence this was picked up for detailed study. | 5 |
| Without restricting appropriate access for existing airport operations, there was limited space available to be given to the contractor for setting up the fabrication yard, Concrete batching plant and its operations, and equipment storage. Maneuverability of equipment and vehicle were also constrained within the project area. | Anchor: access restriction;category: site constraint | Lack of proper road network within the project area led to equipment underutilization and hindered movement of project resources. This, however, finally did not cause project delay. | 6 |
| Rerouting of existing operational utilities, services, and communication cables from the project area in the absence of their detailed drawings. Most of these were serving the existing airport, and any inadvertent damage during excavation or other works would be potentially disruptive for airport operations. | Anchor: knowledge of existing utilities network/layout;category: site constraint | While this was a “known unknown”, it led to uncertainty with potential to affect schedule. This was managed by the AAI with additional efforts and emerged as a learning point from this study. | 7 |
- (a)
There was a storm water pond in the project area, which needed to be filled up as a part of site preparation activity. - (b)
Rerouting of inlet to pond and its discharge into the existing drainage system of the civic authority
| Anchor: reclamation of land/brownfield contamination;category: site constraint | Though pond filling activity was planned, the rerouting of the inlet to pond was not initially budgeted. This was included as a revision, but finally, it did not delay the project. | 8 |
Location of operational aviation turbine fuel storage tank area near the project construction site (on the fringes of Zone 6). This required the following:
- (a)
implementation of additional safety measures during construction - (b)
maintenance of access roads for tankers approaching from the city side to the fuel storage tank area throughout the construction period.
| Anchor: land encumbrance;category: site constraint | Efforts to get the fuel oil marketing firm to relocate their fuel storage tanks did not materialize and needed repeated changing of temporary access roads to allow tankers to reach the fuel storage tank area. No delay in project schedule. | 9 |
| Lengthy organizational procedure for effecting any change in contract, such as Bill of Material, specifications, quantities, services, and other change orders that may become necessary during project execution. | Anchor: organization procedural environment;category: governance constraint | Layouts or numbers were required to be shared and agreed with the contractor to know the flexibility on the availability of material or substitutes and their construction viability before implementing the drawings for construction purposes. No delay in schedule. | 10 |
